<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019c6bfb-b8ff-7bc1-bf37-bbe1f0c70f79,g:8d54d1ce-46a7-4d59-843d-4297e47c4fa4-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.kellyservices.com/role/Cover" xlink:type="simple" xlink:href="kelya-20260329.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019c6bfb-ba4d-74bd-951c-656b8dbe0958" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_DocumentInformationTable_019c6bfb-ba4d-74bd-951c-656b8dbe0958" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsExchangeAxis_019c6bfb-ba4d-7252-bf10-a0dc1755043f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityListingsExchangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019c6bfb-ba4d-74bd-951c-656b8dbe0958" xlink:to="loc_dei_EntityListingsExchangeAxis_019c6bfb-ba4d-7252-bf10-a0dc1755043f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_019c6bfb-ba4d-7252-bf10-a0dc1755043f_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityListingsExchangeAxis_019c6bfb-ba4d-7252-bf10-a0dc1755043f" xlink:to="loc_dei_ExchangeDomain_019c6bfb-ba4d-7252-bf10-a0dc1755043f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_019c6bfb-ba4d-736f-955a-3db0bfc1278f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityListingsExchangeAxis_019c6bfb-ba4d-7252-bf10-a0dc1755043f" xlink:to="loc_dei_ExchangeDomain_019c6bfb-ba4d-736f-955a-3db0bfc1278f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_exch_XNMS_019c6bfb-ba4d-7e6a-9f96-fdb04d7fb557" xlink:href="https://xbrl.sec.gov/exch/2025/exch-2025.xsd#exch_XNMS"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_ExchangeDomain_019c6bfb-ba4d-736f-955a-3db0bfc1278f" xlink:to="loc_exch_XNMS_019c6bfb-ba4d-7e6a-9f96-fdb04d7fb557" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-ba4d-7691-8c13-7a0b2bb3350e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019c6bfb-ba4d-74bd-951c-656b8dbe0958" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-ba4d-7691-8c13-7a0b2bb3350e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c6bfb-ba4d-7691-8c13-7a0b2bb3350e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-ba4d-7691-8c13-7a0b2bb3350e" xlink:to="loc_us-gaap_ClassOfStockDomain_019c6bfb-ba4d-7691-8c13-7a0b2bb3350e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c6bfb-ba4d-73d7-be4e-f0ed1480c921" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-ba4d-7691-8c13-7a0b2bb3350e" xlink:to="loc_us-gaap_ClassOfStockDomain_019c6bfb-ba4d-73d7-be4e-f0ed1480c921" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c6bfb-ba4d-7882-98ed-fe3d3322c334" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c6bfb-ba4d-73d7-be4e-f0ed1480c921" xlink:to="loc_us-gaap_CommonClassAMember_019c6bfb-ba4d-7882-98ed-fe3d3322c334" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c6bfb-ba4d-7c86-a405-f5cfbc2b5130" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c6bfb-ba4d-73d7-be4e-f0ed1480c921" xlink:to="loc_us-gaap_CommonClassBMember_019c6bfb-ba4d-7c86-a405-f5cfbc2b5130" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019c6bfb-ba4d-7e4c-aa54-5bbec8a422e8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_DocumentType_019c6bfb-ba4d-7e4c-aa54-5bbec8a422e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019c6bfb-ba4d-7fc9-b410-247169b84452" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_DocumentQuarterlyReport_019c6bfb-ba4d-7fc9-b410-247169b84452" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019c6bfb-ba4d-7c41-8401-8da43526c656" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_DocumentPeriodEndDate_019c6bfb-ba4d-7c41-8401-8da43526c656" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019c6bfb-ba4d-7b82-87e8-a6ca1adf31e8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_DocumentTransitionReport_019c6bfb-ba4d-7b82-87e8-a6ca1adf31e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019c6bfb-ba4d-7fa0-bd3c-c8d1f43074e2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityFileNumber_019c6bfb-ba4d-7fa0-bd3c-c8d1f43074e2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019c6bfb-ba4d-7aad-91a4-7e448c15e830" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityRegistrantName_019c6bfb-ba4d-7aad-91a4-7e448c15e830" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019c6bfb-ba4d-7476-ae28-08afd3339d23" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019c6bfb-ba4d-7476-ae28-08afd3339d23" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019c6bfb-ba4d-7aae-8be8-d6a3a12d8f2e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityTaxIdentificationNumber_019c6bfb-ba4d-7aae-8be8-d6a3a12d8f2e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019c6bfb-ba4d-7422-9ca6-87e63f1b0004" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityAddressAddressLine1_019c6bfb-ba4d-7422-9ca6-87e63f1b0004" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019c6bfb-ba4d-78f2-a7ee-56019a62d0a9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityAddressCityOrTown_019c6bfb-ba4d-78f2-a7ee-56019a62d0a9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019c6bfb-ba4d-7811-bc85-27ae3f62b04b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityAddressStateOrProvince_019c6bfb-ba4d-7811-bc85-27ae3f62b04b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019c6bfb-ba4d-74c4-a872-865480a1a198" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityAddressPostalZipCode_019c6bfb-ba4d-74c4-a872-865480a1a198" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019c6bfb-ba4d-7aed-91c0-a415c9509030" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_CityAreaCode_019c6bfb-ba4d-7aed-91c0-a415c9509030" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019c6bfb-ba4d-7384-9647-6af926f82d23" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_LocalPhoneNumber_019c6bfb-ba4d-7384-9647-6af926f82d23" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019c6bfb-ba4d-78c5-803d-847927fe2927" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_Security12bTitle_019c6bfb-ba4d-78c5-803d-847927fe2927" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019c6bfb-ba4d-72cf-a2fb-405788adaeb2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_TradingSymbol_019c6bfb-ba4d-72cf-a2fb-405788adaeb2" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019c6bfb-ba4d-74c5-a3a2-bb7963fe5597" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_SecurityExchangeName_019c6bfb-ba4d-74c5-a3a2-bb7963fe5597" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019c6bfb-ba4d-72a5-b534-1723edb8538c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityCurrentReportingStatus_019c6bfb-ba4d-72a5-b534-1723edb8538c" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019c6bfb-ba4d-7608-a28e-bee2a61b5c24" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityInteractiveDataCurrent_019c6bfb-ba4d-7608-a28e-bee2a61b5c24" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019c6bfb-ba4d-7900-adf5-f0d43aaa037c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityFilerCategory_019c6bfb-ba4d-7900-adf5-f0d43aaa037c" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019c6bfb-ba4d-7946-84ba-ddd96cb494f5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntitySmallBusiness_019c6bfb-ba4d-7946-84ba-ddd96cb494f5" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019c6bfb-ba4d-752c-9b54-04a4323775db" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityEmergingGrowthCompany_019c6bfb-ba4d-752c-9b54-04a4323775db" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019c6bfb-ba4d-7a2a-bada-0f266086065c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityShellCompany_019c6bfb-ba4d-7a2a-bada-0f266086065c" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019c6bfb-ba4d-7442-a974-37d2e8bf66df" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019c6bfb-ba4d-7442-a974-37d2e8bf66df" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019c6bfb-ba4d-72a4-8c71-e8e6f8a51543" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_CurrentFiscalYearEndDate_019c6bfb-ba4d-72a4-8c71-e8e6f8a51543" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019c6bfb-ba4d-7f18-a2dd-38bf4e6ec7b5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_AmendmentFlag_019c6bfb-ba4d-7f18-a2dd-38bf4e6ec7b5" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019c6bfb-ba4d-7ec3-b7d3-c2dcb49fbf9e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_EntityCentralIndexKey_019c6bfb-ba4d-7ec3-b7d3-c2dcb49fbf9e" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019c6bfb-ba4d-7194-857f-e221f10418ff" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_DocumentFiscalYearFocus_019c6bfb-ba4d-7194-857f-e221f10418ff" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019c6bfb-ba4d-7ad5-8ffd-a9fc93631708" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c6bfb-ba4d-7b2c-a478-d90533af481c" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019c6bfb-ba4d-7ad5-8ffd-a9fc93631708" xlink:type="arc" order="28"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:type="simple" xlink:href="kelya-20260329.xsd#ConsolidatedBalanceSheetsUnaudited"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c6bfb-ba4d-7ac0-a4e2-84557205d9c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c6bfb-ba4d-7d84-84f8-1a97c47b986c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-ba4d-7ac0-a4e2-84557205d9c0" xlink:to="loc_us-gaap_StatementTable_019c6bfb-ba4d-7d84-84f8-1a97c47b986c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-ba4d-702d-88aa-99352dba26ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c6bfb-ba4d-7d84-84f8-1a97c47b986c" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-ba4d-702d-88aa-99352dba26ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c6bfb-ba4d-702d-88aa-99352dba26ac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-ba4d-702d-88aa-99352dba26ac" xlink:to="loc_us-gaap_ClassOfStockDomain_019c6bfb-ba4d-702d-88aa-99352dba26ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c6bfb-ba4d-723b-bda7-83b55a193020" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-ba4d-702d-88aa-99352dba26ac" xlink:to="loc_us-gaap_ClassOfStockDomain_019c6bfb-ba4d-723b-bda7-83b55a193020" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c6bfb-ba4d-775f-a9b1-dac5ed6d4f3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c6bfb-ba4d-723b-bda7-83b55a193020" xlink:to="loc_us-gaap_CommonClassAMember_019c6bfb-ba4d-775f-a9b1-dac5ed6d4f3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c6bfb-ba4d-716f-915d-70316bcb4a9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c6bfb-ba4d-723b-bda7-83b55a193020" xlink:to="loc_us-gaap_CommonClassBMember_019c6bfb-ba4d-716f-915d-70316bcb4a9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_019c6bfb-ba4d-73fc-be2c-b62d4d900343" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-ba4d-7ac0-a4e2-84557205d9c0" xlink:to="loc_us-gaap_AssetsCurrentAbstract_019c6bfb-ba4d-73fc-be2c-b62d4d900343" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c6bfb-ba4d-7fa1-b7a8-206c77660c5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019c6bfb-ba4d-73fc-be2c-b62d4d900343" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c6bfb-ba4d-7fa1-b7a8-206c77660c5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_019c6bfb-ba4d-75e5-824b-a0586cd37396" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019c6bfb-ba4d-73fc-be2c-b62d4d900343" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_019c6bfb-ba4d-75e5-824b-a0586cd37396" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019c6bfb-ba4d-747e-a52c-1831613fd022" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019c6bfb-ba4d-73fc-be2c-b62d4d900343" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019c6bfb-ba4d-747e-a52c-1831613fd022" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019c6bfb-ba4d-7faa-8dfc-21985fa53ff2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019c6bfb-ba4d-73fc-be2c-b62d4d900343" xlink:to="loc_us-gaap_AssetsCurrent_019c6bfb-ba4d-7faa-8dfc-21985fa53ff2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNoncurrentAbstract_019c6bfb-ba4d-7fc2-b735-4ee439ea1baf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-ba4d-7ac0-a4e2-84557205d9c0" xlink:to="loc_us-gaap_AssetsNoncurrentAbstract_019c6bfb-ba4d-7fc2-b735-4ee439ea1baf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019c6bfb-ba4d-788a-9cbe-3f9bfdf66d24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_019c6bfb-ba4d-7fc2-b735-4ee439ea1baf" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019c6bfb-ba4d-788a-9cbe-3f9bfdf66d24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019c6bfb-ba4d-7dbe-a9bd-bf873904b51c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_019c6bfb-ba4d-7fc2-b735-4ee439ea1baf" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019c6bfb-ba4d-7dbe-a9bd-bf873904b51c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_019c6bfb-ba4d-7c71-8648-51dccabc33e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_019c6bfb-ba4d-7fc2-b735-4ee439ea1baf" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_019c6bfb-ba4d-7c71-8648-51dccabc33e6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LifeInsuranceCorporateOrBankOwnedAmount_019c6bfb-ba4d-7f1e-bee0-9363d0086975" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LifeInsuranceCorporateOrBankOwnedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_019c6bfb-ba4d-7fc2-b735-4ee439ea1baf" xlink:to="loc_us-gaap_LifeInsuranceCorporateOrBankOwnedAmount_019c6bfb-ba4d-7f1e-bee0-9363d0086975" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019c6bfb-ba4d-7e0d-9f79-e7eb0761382e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_019c6bfb-ba4d-7fc2-b735-4ee439ea1baf" xlink:to="loc_us-gaap_Goodwill_019c6bfb-ba4d-7e0d-9f79-e7eb0761382e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019c6bfb-ba4d-7e03-82ae-e2b5dbbd6a7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_019c6bfb-ba4d-7fc2-b735-4ee439ea1baf" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_019c6bfb-ba4d-7e03-82ae-e2b5dbbd6a7e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019c6bfb-ba4d-70ca-8827-ab36b218abbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_019c6bfb-ba4d-7fc2-b735-4ee439ea1baf" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_019c6bfb-ba4d-70ca-8827-ab36b218abbd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNoncurrent_019c6bfb-ba4d-7904-b7e9-638afd51ed5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_019c6bfb-ba4d-7fc2-b735-4ee439ea1baf" xlink:to="loc_us-gaap_AssetsNoncurrent_019c6bfb-ba4d-7904-b7e9-638afd51ed5c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019c6bfb-ba4d-73ea-8482-284516265bc3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-ba4d-7ac0-a4e2-84557205d9c0" xlink:to="loc_us-gaap_Assets_019c6bfb-ba4d-73ea-8482-284516265bc3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c6bfb-ba4d-741b-ac30-29b9a536b60a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-ba4d-7ac0-a4e2-84557205d9c0" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c6bfb-ba4d-741b-ac30-29b9a536b60a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_019c6bfb-ba4d-79b4-8ad8-5a8d9ff85528" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c6bfb-ba4d-741b-ac30-29b9a536b60a" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_019c6bfb-ba4d-79b4-8ad8-5a8d9ff85528" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_019c6bfb-ba4d-7e18-80af-8b620fee8f54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c6bfb-ba4d-79b4-8ad8-5a8d9ff85528" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_019c6bfb-ba4d-7e18-80af-8b620fee8f54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_019c6bfb-ba4d-746e-b87a-9dd5c627c34f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c6bfb-ba4d-79b4-8ad8-5a8d9ff85528" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_019c6bfb-ba4d-746e-b87a-9dd5c627c34f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_019c6bfb-ba4d-7077-8e90-aa9ea0926006" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c6bfb-ba4d-79b4-8ad8-5a8d9ff85528" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_019c6bfb-ba4d-7077-8e90-aa9ea0926006" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_AccruedWorkersCompensationAndOtherClaimsCurrent_019c6bfb-ba4d-7c38-88ac-77e441ed2b90" xlink:href="kelya-20260329.xsd#kelya_AccruedWorkersCompensationAndOtherClaimsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c6bfb-ba4d-79b4-8ad8-5a8d9ff85528" xlink:to="loc_kelya_AccruedWorkersCompensationAndOtherClaimsCurrent_019c6bfb-ba4d-7c38-88ac-77e441ed2b90" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxesPayableCurrent_019c6bfb-ba4d-71fe-b96f-e17ceee3710b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TaxesPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c6bfb-ba4d-79b4-8ad8-5a8d9ff85528" xlink:to="loc_us-gaap_TaxesPayableCurrent_019c6bfb-ba4d-71fe-b96f-e17ceee3710b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019c6bfb-ba4d-728e-b688-71658022f31b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c6bfb-ba4d-79b4-8ad8-5a8d9ff85528" xlink:to="loc_us-gaap_LiabilitiesCurrent_019c6bfb-ba4d-728e-b688-71658022f31b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract_019c6bfb-ba4d-79e7-8daf-091f84413861" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c6bfb-ba4d-741b-ac30-29b9a536b60a" xlink:to="loc_us-gaap_LiabilitiesNoncurrentAbstract_019c6bfb-ba4d-79e7-8daf-091f84413861" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019c6bfb-ba4d-7c05-95de-faf63b5a33da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_019c6bfb-ba4d-79e7-8daf-091f84413861" xlink:to="loc_us-gaap_LongTermDebt_019c6bfb-ba4d-7c05-95de-faf63b5a33da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019c6bfb-ba4d-7cbb-abc5-4dff9f64c33c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_019c6bfb-ba4d-79e7-8daf-091f84413861" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019c6bfb-ba4d-7cbb-abc5-4dff9f64c33c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WorkersCompensationLiabilityNoncurrent_019c6bfb-ba4d-7cec-9e6a-7613e44abedb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WorkersCompensationLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_019c6bfb-ba4d-79e7-8daf-091f84413861" xlink:to="loc_us-gaap_WorkersCompensationLiabilityNoncurrent_019c6bfb-ba4d-7cec-9e6a-7613e44abedb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_019c6bfb-ba4d-78b5-a05e-bc6a6495a60d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_019c6bfb-ba4d-79e7-8daf-091f84413861" xlink:to="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_019c6bfb-ba4d-78b5-a05e-bc6a6495a60d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_019c6bfb-ba4d-7525-96ff-1811df58307b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_019c6bfb-ba4d-79e7-8daf-091f84413861" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_019c6bfb-ba4d-7525-96ff-1811df58307b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_019c6bfb-ba4d-704c-9938-f0eb77c0f684" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_019c6bfb-ba4d-79e7-8daf-091f84413861" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_019c6bfb-ba4d-704c-9938-f0eb77c0f684" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019c6bfb-ba4d-7b78-8218-f79057247277" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c6bfb-ba4d-741b-ac30-29b9a536b60a" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019c6bfb-ba4d-7b78-8218-f79057247277" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_019c6bfb-ba4d-79d8-9bac-5efef7b7058f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c6bfb-ba4d-741b-ac30-29b9a536b60a" xlink:to="loc_us-gaap_StockholdersEquityAbstract_019c6bfb-ba4d-79d8-9bac-5efef7b7058f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract_019c6bfb-ba4d-71e6-9e13-b11799c4825b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c6bfb-ba4d-79d8-9bac-5efef7b7058f" xlink:to="loc_us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract_019c6bfb-ba4d-71e6-9e13-b11799c4825b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019c6bfb-ba4d-7429-8a9d-e4b6ec9485f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract_019c6bfb-ba4d-71e6-9e13-b11799c4825b" xlink:to="loc_us-gaap_CommonStockValue_019c6bfb-ba4d-7429-8a9d-e4b6ec9485f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockNumberOfSharesAndRestrictionDisclosuresAbstract_019c6bfb-ba4d-7850-892b-859a9c443093" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockNumberOfSharesAndRestrictionDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c6bfb-ba4d-79d8-9bac-5efef7b7058f" xlink:to="loc_us-gaap_TreasuryStockNumberOfSharesAndRestrictionDisclosuresAbstract_019c6bfb-ba4d-7850-892b-859a9c443093" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_019c6bfb-ba4d-72e3-b850-17ff0e976a3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TreasuryStockNumberOfSharesAndRestrictionDisclosuresAbstract_019c6bfb-ba4d-7850-892b-859a9c443093" xlink:to="loc_us-gaap_TreasuryStockValue_019c6bfb-ba4d-72e3-b850-17ff0e976a3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_019c6bfb-ba4d-757c-9361-6de94c469bec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c6bfb-ba4d-79d8-9bac-5efef7b7058f" xlink:to="loc_us-gaap_AdditionalPaidInCapital_019c6bfb-ba4d-757c-9361-6de94c469bec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019c6bfb-ba4d-762b-a6a6-f059bfcaa6c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c6bfb-ba4d-79d8-9bac-5efef7b7058f" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019c6bfb-ba4d-762b-a6a6-f059bfcaa6c3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019c6bfb-ba4d-7b70-9501-197a957e8a97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c6bfb-ba4d-79d8-9bac-5efef7b7058f" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019c6bfb-ba4d-7b70-9501-197a957e8a97" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019c6bfb-ba4d-768d-b06c-6694d2bd7eb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019c6bfb-ba4d-79d8-9bac-5efef7b7058f" xlink:to="loc_us-gaap_StockholdersEquity_019c6bfb-ba4d-768d-b06c-6694d2bd7eb8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019c6bfb-ba4d-7d39-8332-349ec15a9e42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c6bfb-ba4d-741b-ac30-29b9a536b60a" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019c6bfb-ba4d-7d39-8332-349ec15a9e42" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_019dda5e-6cb7-7308-9a1b-79860027426d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-ba4d-7ac0-a4e2-84557205d9c0" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_019dda5e-6cb7-7308-9a1b-79860027426d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_019dda60-3096-7642-b590-2caeed1b4d70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-ba4d-7ac0-a4e2-84557205d9c0" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_019dda60-3096-7642-b590-2caeed1b4d70" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_019dda60-4d68-7adf-b0e3-b8d4bf4e2b2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-ba4d-7ac0-a4e2-84557205d9c0" xlink:to="loc_us-gaap_CommonStockSharesIssued_019dda60-4d68-7adf-b0e3-b8d4bf4e2b2c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019dda61-31c3-73f1-af95-28dea25ca80c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-ba4d-7ac0-a4e2-84557205d9c0" xlink:to="loc_us-gaap_TreasuryStockCommonShares_019dda61-31c3-73f1-af95-28dea25ca80c" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="simple" xlink:href="kelya-20260329.xsd#ConsolidatedBalanceSheetsUnauditedParenthetical"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c6bfb-bafa-7200-ac74-80275e829d5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c6bfb-bafa-716d-a40e-f1d90b7559a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-bafa-7200-ac74-80275e829d5b" xlink:to="loc_us-gaap_StatementTable_019c6bfb-bafa-716d-a40e-f1d90b7559a3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-bafa-7319-bc84-e9e1bf0c3077" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c6bfb-bafa-716d-a40e-f1d90b7559a3" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-bafa-7319-bc84-e9e1bf0c3077" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-7319-bc84-e9e1bf0c3077_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-bafa-7319-bc84-e9e1bf0c3077" xlink:to="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-7319-bc84-e9e1bf0c3077_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-7134-9438-09bad637866c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-bafa-7319-bc84-e9e1bf0c3077" xlink:to="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-7134-9438-09bad637866c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c6bfb-bafa-776b-84ba-93b85dbbc9af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-7134-9438-09bad637866c" xlink:to="loc_us-gaap_CommonClassAMember_019c6bfb-bafa-776b-84ba-93b85dbbc9af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c6bfb-bafa-709e-8a3a-1c05a2038df2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-7134-9438-09bad637866c" xlink:to="loc_us-gaap_CommonClassBMember_019c6bfb-bafa-709e-8a3a-1c05a2038df2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019c6bfb-bafa-785c-bb11-ee3758363645" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-bafa-7200-ac74-80275e829d5b" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_019c6bfb-bafa-785c-bb11-ee3758363645" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_019c6bfb-bafa-720f-b65c-64d2bd352038" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-bafa-7200-ac74-80275e829d5b" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_019c6bfb-bafa-720f-b65c-64d2bd352038" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_019c6bfb-bafa-7de1-82c3-9f1fe443d01d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-bafa-7200-ac74-80275e829d5b" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_019c6bfb-bafa-7de1-82c3-9f1fe443d01d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_019c6bfb-bafa-7c07-bb43-8e37e118a041" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-bafa-7200-ac74-80275e829d5b" xlink:to="loc_us-gaap_CommonStockSharesIssued_019c6bfb-bafa-7c07-bb43-8e37e118a041" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019c6bfb-bafa-7f87-a9ac-09a7a8326540" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-bafa-7200-ac74-80275e829d5b" xlink:to="loc_us-gaap_TreasuryStockCommonShares_019c6bfb-bafa-7f87-a9ac-09a7a8326540" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/ConsolidatedStatementsofStockholdersEquityUnaudited" xlink:type="simple" xlink:href="kelya-20260329.xsd#ConsolidatedStatementsofStockholdersEquityUnaudited"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/ConsolidatedStatementsofStockholdersEquityUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c6bfb-bafa-71c5-bf2d-54cf374afc37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c6bfb-bafa-7609-a232-3de45ff70eca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-bafa-71c5-bf2d-54cf374afc37" xlink:to="loc_us-gaap_StatementTable_019c6bfb-bafa-7609-a232-3de45ff70eca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c6bfb-bafa-7e70-a179-28efee1b8be0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c6bfb-bafa-7609-a232-3de45ff70eca" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c6bfb-bafa-7e70-a179-28efee1b8be0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c6bfb-bafa-7e70-a179-28efee1b8be0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c6bfb-bafa-7e70-a179-28efee1b8be0" xlink:to="loc_us-gaap_EquityComponentDomain_019c6bfb-bafa-7e70-a179-28efee1b8be0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c6bfb-bafa-775a-b394-1ec77d5a8cfe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c6bfb-bafa-7e70-a179-28efee1b8be0" xlink:to="loc_us-gaap_EquityComponentDomain_019c6bfb-bafa-775a-b394-1ec77d5a8cfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c6bfb-bafa-77ba-9164-87eedf242049" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c6bfb-bafa-775a-b394-1ec77d5a8cfe" xlink:to="loc_us-gaap_CommonStockMember_019c6bfb-bafa-77ba-9164-87eedf242049" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019c6bfb-bafa-7c33-b73e-c9bbfebdbd16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c6bfb-bafa-775a-b394-1ec77d5a8cfe" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019c6bfb-bafa-7c33-b73e-c9bbfebdbd16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019c6bfb-bafa-7293-972d-692b05fcac66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c6bfb-bafa-775a-b394-1ec77d5a8cfe" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019c6bfb-bafa-7293-972d-692b05fcac66" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_EarningsInvestedInTheBusinessMember_019c6bfb-bafa-7550-b01a-e7a2a0152a70" xlink:href="kelya-20260329.xsd#kelya_EarningsInvestedInTheBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c6bfb-bafa-775a-b394-1ec77d5a8cfe" xlink:to="loc_kelya_EarningsInvestedInTheBusinessMember_019c6bfb-bafa-7550-b01a-e7a2a0152a70" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c6bfb-bafa-7d94-8595-6ff75a625a0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c6bfb-bafa-775a-b394-1ec77d5a8cfe" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c6bfb-bafa-7d94-8595-6ff75a625a0b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-bafa-78ce-8e91-1b5de489d08c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c6bfb-bafa-7609-a232-3de45ff70eca" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-bafa-78ce-8e91-1b5de489d08c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-78ce-8e91-1b5de489d08c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-bafa-78ce-8e91-1b5de489d08c" xlink:to="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-78ce-8e91-1b5de489d08c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-7a1b-aa8a-ac1e86dab1e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-bafa-78ce-8e91-1b5de489d08c" xlink:to="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-7a1b-aa8a-ac1e86dab1e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c6bfb-bafa-71ed-8573-fccbf279bb43" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-7a1b-aa8a-ac1e86dab1e7" xlink:to="loc_us-gaap_CommonClassAMember_019c6bfb-bafa-71ed-8573-fccbf279bb43" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c6bfb-bafa-775a-a01f-17261ef8c880" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-7a1b-aa8a-ac1e86dab1e7" xlink:to="loc_us-gaap_CommonClassBMember_019c6bfb-bafa-775a-a01f-17261ef8c880" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_CommonClassATreasuryStockMember_019c6bfb-bafa-7d3d-9c0a-344e2f96d57d" xlink:href="kelya-20260329.xsd#kelya_CommonClassATreasuryStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-7a1b-aa8a-ac1e86dab1e7" xlink:to="loc_kelya_CommonClassATreasuryStockMember_019c6bfb-bafa-7d3d-9c0a-344e2f96d57d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_CommonClassBTreasuryStockMember_019c6bfb-bafa-7b33-a839-db2cca876ae2" xlink:href="kelya-20260329.xsd#kelya_CommonClassBTreasuryStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafa-7a1b-aa8a-ac1e86dab1e7" xlink:to="loc_kelya_CommonClassBTreasuryStockMember_019c6bfb-bafa-7b33-a839-db2cca876ae2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c6bfb-bafa-7859-80b4-e6e5293bfe62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c6bfb-bafa-71c5-bf2d-54cf374afc37" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c6bfb-bafa-7859-80b4-e6e5293bfe62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019c6bfb-bafa-7757-9eb4-21fa748f68ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c6bfb-bafa-7859-80b4-e6e5293bfe62" xlink:to="loc_us-gaap_StockholdersEquity_019c6bfb-bafa-7757-9eb4-21fa748f68ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019c6bfb-bafa-70c4-bb43-babeaa6beebd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c6bfb-bafa-7859-80b4-e6e5293bfe62" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019c6bfb-bafa-70c4-bb43-babeaa6beebd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019c6bfb-bafa-7136-9649-22cda31ada20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c6bfb-bafa-7859-80b4-e6e5293bfe62" xlink:to="loc_us-gaap_NetIncomeLoss_019c6bfb-bafa-7136-9649-22cda31ada20" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_019c6bfb-bafa-71aa-b7e6-85e6d1ddd48c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c6bfb-bafa-7859-80b4-e6e5293bfe62" xlink:to="loc_us-gaap_DividendsCommonStockCash_019c6bfb-bafa-71aa-b7e6-85e6d1ddd48c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019dd02f-bf44-79e5-addc-9fa6e7cbb14a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c6bfb-bafa-7859-80b4-e6e5293bfe62" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019dd02f-bf44-79e5-addc-9fa6e7cbb14a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019c6bfb-bafa-79f6-b33b-7ee13aefeb28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/RevenueDisaggregationofRevenuesbyServiceTypeDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#RevenueDisaggregationofRevenuesbyServiceTypeDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/RevenueDisaggregationofRevenuesbyServiceTypeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019c6bfb-bafa-771f-82fa-c432494def3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019c6bfb-bafa-72af-9e72-4752b4f355a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c6bfb-bafa-771f-82fa-c432494def3f" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019c6bfb-bafa-72af-9e72-4752b4f355a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019c6bfb-bafa-77e1-b8ba-729d84dbfe6f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c6bfb-bafa-72af-9e72-4752b4f355a4" xlink:to="loc_srt_ConsolidationItemsAxis_019c6bfb-bafa-77e1-b8ba-729d84dbfe6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c6bfb-bafa-77e1-b8ba-729d84dbfe6f_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019c6bfb-bafa-77e1-b8ba-729d84dbfe6f" xlink:to="loc_srt_ConsolidationItemsDomain_019c6bfb-bafa-77e1-b8ba-729d84dbfe6f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c6bfb-bafa-75f1-8d9c-3089b691ba47" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019c6bfb-bafa-77e1-b8ba-729d84dbfe6f" xlink:to="loc_srt_ConsolidationItemsDomain_019c6bfb-bafa-75f1-8d9c-3089b691ba47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019c6bfb-bafa-7305-afa9-6509a31e2cec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c6bfb-bafa-75f1-8d9c-3089b691ba47" xlink:to="loc_us-gaap_OperatingSegmentsMember_019c6bfb-bafa-7305-afa9-6509a31e2cec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_019c6bfb-bafa-7ac3-96a1-1e1e2d2243f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c6bfb-bafa-75f1-8d9c-3089b691ba47" xlink:to="loc_us-gaap_IntersegmentEliminationMember_019c6bfb-bafa-7ac3-96a1-1e1e2d2243f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsAxis_019c6bfb-bafa-7698-bc22-a8fb0e45ca73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c6bfb-bafa-72af-9e72-4752b4f355a4" xlink:to="loc_us-gaap_SubsegmentsAxis_019c6bfb-bafa-7698-bc22-a8fb0e45ca73" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019c6bfb-bafa-7698-bc22-a8fb0e45ca73_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsegmentsAxis_019c6bfb-bafa-7698-bc22-a8fb0e45ca73" xlink:to="loc_us-gaap_SubsegmentsDomain_019c6bfb-bafa-7698-bc22-a8fb0e45ca73_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsegmentsDomain_019c6bfb-bafa-7a3c-9ff2-19a52d2f0411" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsegmentsAxis_019c6bfb-bafa-7698-bc22-a8fb0e45ca73" xlink:to="loc_us-gaap_SubsegmentsDomain_019c6bfb-bafa-7a3c-9ff2-19a52d2f0411" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_StaffingServicesMember_019c6bfb-bafa-759a-9975-0448914d4811" xlink:href="kelya-20260329.xsd#kelya_StaffingServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_019c6bfb-bafa-7a3c-9ff2-19a52d2f0411" xlink:to="loc_kelya_StaffingServicesMember_019c6bfb-bafa-759a-9975-0448914d4811" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_OutcomeBasedServicesMember_019c6bfb-bafa-782d-a34e-ffa1785d0a4b" xlink:href="kelya-20260329.xsd#kelya_OutcomeBasedServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_019c6bfb-bafa-7a3c-9ff2-19a52d2f0411" xlink:to="loc_kelya_OutcomeBasedServicesMember_019c6bfb-bafa-782d-a34e-ffa1785d0a4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_TalentSolutionsMember_019c6bfb-bafa-7ded-a3e3-7fd584e25c5b" xlink:href="kelya-20260329.xsd#kelya_TalentSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_019c6bfb-bafa-7a3c-9ff2-19a52d2f0411" xlink:to="loc_kelya_TalentSolutionsMember_019c6bfb-bafa-7ded-a3e3-7fd584e25c5b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_PermanentPlacementMember_019c6bfb-bafa-741a-8f37-5a63d117fa31" xlink:href="kelya-20260329.xsd#kelya_PermanentPlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsegmentsDomain_019c6bfb-bafa-7a3c-9ff2-19a52d2f0411" xlink:to="loc_kelya_PermanentPlacementMember_019c6bfb-bafa-741a-8f37-5a63d117fa31" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bafa-75dc-b79f-37c18a9d878e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c6bfb-bafa-72af-9e72-4752b4f355a4" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bafa-75dc-b79f-37c18a9d878e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c6bfb-bafa-75dc-b79f-37c18a9d878e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bafa-75dc-b79f-37c18a9d878e" xlink:to="loc_us-gaap_SegmentDomain_019c6bfb-bafa-75dc-b79f-37c18a9d878e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c6bfb-bafa-78c5-80f5-2815cd8a14fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bafa-75dc-b79f-37c18a9d878e" xlink:to="loc_us-gaap_SegmentDomain_019c6bfb-bafa-78c5-80f5-2815cd8a14fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_EnterpriseTalentManagementMember_019c6bfb-bafa-7df2-9d3d-363d3174c360" xlink:href="kelya-20260329.xsd#kelya_EnterpriseTalentManagementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c6bfb-bafa-78c5-80f5-2815cd8a14fb" xlink:to="loc_kelya_EnterpriseTalentManagementMember_019c6bfb-bafa-7df2-9d3d-363d3174c360" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_ScienceEngineeringTechnologyMember_019c6bfb-bafa-7169-bb4c-891cb59d2c11" xlink:href="kelya-20260329.xsd#kelya_ScienceEngineeringTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c6bfb-bafa-78c5-80f5-2815cd8a14fb" xlink:to="loc_kelya_ScienceEngineeringTechnologyMember_019c6bfb-bafa-7169-bb4c-891cb59d2c11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_EducationMember_019c6bfb-bafa-7c20-a62f-752d6eba78b0" xlink:href="kelya-20260329.xsd#kelya_EducationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c6bfb-bafa-78c5-80f5-2815cd8a14fb" xlink:to="loc_kelya_EducationMember_019c6bfb-bafa-7c20-a62f-752d6eba78b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c6bfb-bafa-755e-88e5-88a0c61c6ec8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c6bfb-bafa-771f-82fa-c432494def3f" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c6bfb-bafa-755e-88e5-88a0c61c6ec8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/RevenueRevenuebyGeographyDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#RevenueRevenuebyGeographyDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/RevenueRevenuebyGeographyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019c6bfb-bafa-7958-8836-68cbea6050ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019c6bfb-bafa-7624-80fc-ac457d905a44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c6bfb-bafa-7958-8836-68cbea6050ab" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019c6bfb-bafa-7624-80fc-ac457d905a44" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c6bfb-bafa-7b00-9461-a8ec95ac14bb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c6bfb-bafa-7624-80fc-ac457d905a44" xlink:to="loc_srt_StatementGeographicalAxis_019c6bfb-bafa-7b00-9461-a8ec95ac14bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c6bfb-bafa-7b00-9461-a8ec95ac14bb_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c6bfb-bafa-7b00-9461-a8ec95ac14bb" xlink:to="loc_srt_SegmentGeographicalDomain_019c6bfb-bafa-7b00-9461-a8ec95ac14bb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c6bfb-bafa-7e7f-9edd-d1930ccb31a2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c6bfb-bafa-7b00-9461-a8ec95ac14bb" xlink:to="loc_srt_SegmentGeographicalDomain_019c6bfb-bafa-7e7f-9edd-d1930ccb31a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_019c6bfb-bafa-7e59-abf6-7cb0bff8f731" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c6bfb-bafa-7e7f-9edd-d1930ccb31a2" xlink:to="loc_srt_AmericasMember_019c6bfb-bafa-7e59-abf6-7cb0bff8f731" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019c6bfb-bafa-7ef2-a826-0b2000e3aad2" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_AmericasMember_019c6bfb-bafa-7e59-abf6-7cb0bff8f731" xlink:to="loc_country_US_019c6bfb-bafa-7ef2-a826-0b2000e3aad2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_OtherAmericasMember_019c6bfb-bafa-7b2a-b386-56af7f00de71" xlink:href="kelya-20260329.xsd#kelya_OtherAmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_AmericasMember_019c6bfb-bafa-7e59-abf6-7cb0bff8f731" xlink:to="loc_kelya_OtherAmericasMember_019c6bfb-bafa-7b2a-b386-56af7f00de71" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_019c6bfb-bafa-7459-8c79-947cb28048b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c6bfb-bafa-7e7f-9edd-d1930ccb31a2" xlink:to="loc_us-gaap_EMEAMember_019c6bfb-bafa-7459-8c79-947cb28048b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_019c6bfb-bafa-7ae4-a46e-68a02a9d356a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c6bfb-bafa-7e7f-9edd-d1930ccb31a2" xlink:to="loc_srt_AsiaPacificMember_019c6bfb-bafa-7ae4-a46e-68a02a9d356a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c6bfb-bafa-7521-a99c-96ef0241a472" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c6bfb-bafa-7958-8836-68cbea6050ab" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c6bfb-bafa-7521-a99c-96ef0241a472" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/FairValueMeasurementsScheduleofAssetsMeasuredatFairValueonaRecurringBasisDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#FairValueMeasurementsScheduleofAssetsMeasuredatFairValueonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/FairValueMeasurementsScheduleofAssetsMeasuredatFairValueonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c6bfb-bafb-7783-b3e1-7825ffc3934e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c6bfb-bafb-7fe0-ad8b-47b62b3a776c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c6bfb-bafb-7783-b3e1-7825ffc3934e" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c6bfb-bafb-7fe0-ad8b-47b62b3a776c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c6bfb-bafb-7213-a792-57a72d723be1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c6bfb-bafb-7fe0-ad8b-47b62b3a776c" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c6bfb-bafb-7213-a792-57a72d723be1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c6bfb-bafb-7213-a792-57a72d723be1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c6bfb-bafb-7213-a792-57a72d723be1" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c6bfb-bafb-7213-a792-57a72d723be1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c6bfb-bafb-7f50-b24a-94a0a7cf70db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c6bfb-bafb-7213-a792-57a72d723be1" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c6bfb-bafb-7f50-b24a-94a0a7cf70db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019c6bfb-bafb-774b-920c-069739f190f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c6bfb-bafb-7f50-b24a-94a0a7cf70db" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019c6bfb-bafb-774b-920c-069739f190f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c6bfb-bafb-7a71-9a5c-fda6b1776c20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c6bfb-bafb-7fe0-ad8b-47b62b3a776c" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c6bfb-bafb-7a71-9a5c-fda6b1776c20" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c6bfb-bafb-7a71-9a5c-fda6b1776c20_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c6bfb-bafb-7a71-9a5c-fda6b1776c20" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c6bfb-bafb-7a71-9a5c-fda6b1776c20_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c6bfb-bafb-7096-9b5e-5afe08168502" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c6bfb-bafb-7a71-9a5c-fda6b1776c20" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c6bfb-bafb-7096-9b5e-5afe08168502" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019c6bfb-bafb-7946-8eb1-0dbcc12442f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c6bfb-bafb-7096-9b5e-5afe08168502" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019c6bfb-bafb-7946-8eb1-0dbcc12442f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019c6bfb-bafb-7302-a1e4-ce0d035143ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c6bfb-bafb-7096-9b5e-5afe08168502" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019c6bfb-bafb-7302-a1e4-ce0d035143ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019c6bfb-bafb-7469-9e1d-f071a1b64018" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c6bfb-bafb-7096-9b5e-5afe08168502" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019c6bfb-bafb-7469-9e1d-f071a1b64018" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c6bfb-bafb-77da-ad53-80644e4c8270" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c6bfb-bafb-7fe0-ad8b-47b62b3a776c" xlink:to="loc_srt_StatementGeographicalAxis_019c6bfb-bafb-77da-ad53-80644e4c8270" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c6bfb-bafb-77da-ad53-80644e4c8270_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c6bfb-bafb-77da-ad53-80644e4c8270" xlink:to="loc_srt_SegmentGeographicalDomain_019c6bfb-bafb-77da-ad53-80644e4c8270_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c6bfb-bafb-737a-9d86-732d6c71ee05" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c6bfb-bafb-77da-ad53-80644e4c8270" xlink:to="loc_srt_SegmentGeographicalDomain_019c6bfb-bafb-737a-9d86-732d6c71ee05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_019c6bfb-bafb-7e69-b3c1-59d51fb6f7d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c6bfb-bafb-737a-9d86-732d6c71ee05" xlink:to="loc_us-gaap_EMEAMember_019c6bfb-bafb-7e69-b3c1-59d51fb6f7d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_BR_019c6bfb-bafb-7cd5-a340-6f2f44aa4495" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_BR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c6bfb-bafb-737a-9d86-732d6c71ee05" xlink:to="loc_country_BR_019c6bfb-bafb-7cd5-a340-6f2f44aa4495" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_019c6bfb-bafb-719d-ab2a-59e8880d0bda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c6bfb-bafb-7783-b3e1-7825ffc3934e" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_019c6bfb-bafb-719d-ab2a-59e8880d0bda" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsAtCarryingValue_019c6bfb-bafb-78c0-a00a-84cd140412ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019c6bfb-bafb-719d-ab2a-59e8880d0bda" xlink:to="loc_us-gaap_MoneyMarketFundsAtCarryingValue_019c6bfb-bafb-78c0-a00a-84cd140412ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019c6bfb-bafb-7eb4-a1a7-09897ab66b94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_019c6bfb-bafb-719d-ab2a-59e8880d0bda" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019c6bfb-bafb-7eb4-a1a7-09897ab66b94" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019c6bfb-bafb-7e79-8b84-c7d1c9b438f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c6bfb-bafb-7783-b3e1-7825ffc3934e" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019c6bfb-bafb-7e79-8b84-c7d1c9b438f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_IndemnificationFairValueDisclosure_019c6bfb-bafb-7f27-b3dd-cc6cea3edc9a" xlink:href="kelya-20260329.xsd#kelya_IndemnificationFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019c6bfb-bafb-7e79-8b84-c7d1c9b438f9" xlink:to="loc_kelya_IndemnificationFairValueDisclosure_019c6bfb-bafb-7f27-b3dd-cc6cea3edc9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019c6bfb-bafb-7b83-bd36-4fc9064e24b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_019c6bfb-bafb-7e79-8b84-c7d1c9b438f9" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019c6bfb-bafb-7b83-bd36-4fc9064e24b9" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#FairValueMeasurementsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c6bfb-bafb-7411-a60f-2bfabd34d680" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c6bfb-bafb-7700-8863-6ec43773dd73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c6bfb-bafb-7411-a60f-2bfabd34d680" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c6bfb-bafb-7700-8863-6ec43773dd73" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c6bfb-bafb-7d29-a2ed-b222fb0d43d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c6bfb-bafb-7700-8863-6ec43773dd73" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c6bfb-bafb-7d29-a2ed-b222fb0d43d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c6bfb-bafb-7d29-a2ed-b222fb0d43d0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c6bfb-bafb-7d29-a2ed-b222fb0d43d0" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c6bfb-bafb-7d29-a2ed-b222fb0d43d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c6bfb-bafb-7b3d-962d-c090643b9536" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c6bfb-bafb-7d29-a2ed-b222fb0d43d0" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c6bfb-bafb-7b3d-962d-c090643b9536" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019c6bfb-bafb-751a-9e13-caadfa328a17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c6bfb-bafb-7b3d-962d-c090643b9536" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019c6bfb-bafb-751a-9e13-caadfa328a17" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_019c6bfb-bafb-7d40-9b58-70e5acdadfee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c6bfb-bafb-7700-8863-6ec43773dd73" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_019c6bfb-bafb-7d40-9b58-70e5acdadfee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019c6bfb-bafb-7d40-9b58-70e5acdadfee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019c6bfb-bafb-7d40-9b58-70e5acdadfee" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019c6bfb-bafb-7d40-9b58-70e5acdadfee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019c6bfb-bafb-7561-83a7-b1cdff28dbff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019c6bfb-bafb-7d40-9b58-70e5acdadfee" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019c6bfb-bafb-7561-83a7-b1cdff28dbff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesMember_019c6bfb-bafb-78f2-8621-e4af640f43cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019c6bfb-bafb-7561-83a7-b1cdff28dbff" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesMember_019c6bfb-bafb-78f2-8621-e4af640f43cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_OtherLongTermLiabilitiesMember_019c6bfb-bafb-7dc3-b2a6-da25e3b92a93" xlink:href="kelya-20260329.xsd#kelya_OtherLongTermLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019c6bfb-bafb-7561-83a7-b1cdff28dbff" xlink:to="loc_kelya_OtherLongTermLiabilitiesMember_019c6bfb-bafb-7dc3-b2a6-da25e3b92a93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c6bfb-bafb-71b6-931d-c0b772bc9872" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c6bfb-bafb-7700-8863-6ec43773dd73" xlink:to="loc_srt_StatementGeographicalAxis_019c6bfb-bafb-71b6-931d-c0b772bc9872" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c6bfb-bafb-71b6-931d-c0b772bc9872_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c6bfb-bafb-71b6-931d-c0b772bc9872" xlink:to="loc_srt_SegmentGeographicalDomain_019c6bfb-bafb-71b6-931d-c0b772bc9872_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c6bfb-bafb-70ea-8558-95329883002b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c6bfb-bafb-71b6-931d-c0b772bc9872" xlink:to="loc_srt_SegmentGeographicalDomain_019c6bfb-bafb-70ea-8558-95329883002b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_EMEAAndBrazilMember_019dcffc-6362-76aa-8e57-bf8db6fdbb6c" xlink:href="kelya-20260329.xsd#kelya_EMEAAndBrazilMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c6bfb-bafb-70ea-8558-95329883002b" xlink:to="loc_kelya_EMEAAndBrazilMember_019dcffc-6362-76aa-8e57-bf8db6fdbb6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_019c6bfb-bafb-7521-b50e-f6e479ecb66e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c6bfb-bafb-70ea-8558-95329883002b" xlink:to="loc_us-gaap_EMEAMember_019c6bfb-bafb-7521-b50e-f6e479ecb66e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_BR_019c6bfb-bafb-72b4-9c27-b3aba1aeb822" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_BR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c6bfb-bafb-70ea-8558-95329883002b" xlink:to="loc_country_BR_019c6bfb-bafb-72b4-9c27-b3aba1aeb822" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c6bfb-bafb-7570-b019-86062f1bc030" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c6bfb-bafb-7700-8863-6ec43773dd73" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c6bfb-bafb-7570-b019-86062f1bc030" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c6bfb-bafb-7570-b019-86062f1bc030_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c6bfb-bafb-7570-b019-86062f1bc030" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c6bfb-bafb-7570-b019-86062f1bc030_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c6bfb-bafb-72cc-8b50-bfad7cc29115" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_019c6bfb-bafb-7570-b019-86062f1bc030" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c6bfb-bafb-72cc-8b50-bfad7cc29115" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_019c6bfb-bafb-7c0b-9724-81d5f3e455dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_019c6bfb-bafb-72cc-8b50-bfad7cc29115" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_019c6bfb-bafb-7c0b-9724-81d5f3e455dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019c6bfb-bafb-78b1-a96a-8624ca817fd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c6bfb-bafb-7700-8863-6ec43773dd73" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019c6bfb-bafb-78b1-a96a-8624ca817fd5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c6bfb-bafb-78b1-a96a-8624ca817fd5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019c6bfb-bafb-78b1-a96a-8624ca817fd5" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c6bfb-bafb-78b1-a96a-8624ca817fd5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c6bfb-bafb-7faf-90b9-9d8eb83d54ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019c6bfb-bafb-78b1-a96a-8624ca817fd5" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c6bfb-bafb-7faf-90b9-9d8eb83d54ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019c6bfb-bafb-7bcb-848d-37c464b795f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019c6bfb-bafb-7faf-90b9-9d8eb83d54ae" xlink:to="loc_us-gaap_EquitySecuritiesMember_019c6bfb-bafb-7bcb-848d-37c464b795f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_IndemnificationFairValueDisclosure_019c6bfb-bafb-75c3-b96c-4c1781f80683" xlink:href="kelya-20260329.xsd#kelya_IndemnificationFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c6bfb-bafb-7411-a60f-2bfabd34d680" xlink:to="loc_kelya_IndemnificationFairValueDisclosure_019c6bfb-bafb-75c3-b96c-4c1781f80683" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue_019c6bfb-bafb-7e7b-87af-fe81f24f31d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c6bfb-bafb-7411-a60f-2bfabd34d680" xlink:to="loc_us-gaap_EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue_019c6bfb-bafb-7e7b-87af-fe81f24f31d8" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/IntegrationRealignmentandRestructuringNarrativeDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#IntegrationRealignmentandRestructuringNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/IntegrationRealignmentandRestructuringNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019c6bfb-bafb-713c-99ae-652c47459864" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c6bfb-bafb-7fc4-88ab-4e90a477a4d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c6bfb-bafb-713c-99ae-652c47459864" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c6bfb-bafb-7fc4-88ab-4e90a477a4d9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_019c6bfb-bafb-76d5-90ba-bd80bd55b888" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c6bfb-bafb-7fc4-88ab-4e90a477a4d9" xlink:to="loc_us-gaap_RestructuringPlanAxis_019c6bfb-bafb-76d5-90ba-bd80bd55b888" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019c6bfb-bafb-76d5-90ba-bd80bd55b888_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_019c6bfb-bafb-76d5-90ba-bd80bd55b888" xlink:to="loc_us-gaap_RestructuringPlanDomain_019c6bfb-bafb-76d5-90ba-bd80bd55b888_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019c6bfb-bafb-741d-a154-a6bd9ca0b311" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_019c6bfb-bafb-76d5-90ba-bd80bd55b888" xlink:to="loc_us-gaap_RestructuringPlanDomain_019c6bfb-bafb-741d-a154-a6bd9ca0b311" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_A2026ActionsMember_019dcfff-31bc-7f7d-bdd6-23415eb491a5" xlink:href="kelya-20260329.xsd#kelya_A2026ActionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019c6bfb-bafb-741d-a154-a6bd9ca0b311" xlink:to="loc_kelya_A2026ActionsMember_019dcfff-31bc-7f7d-bdd6-23415eb491a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_A2025ActionsMember_019c6bfb-bafb-78c9-b306-a2b7eec9c2fd" xlink:href="kelya-20260329.xsd#kelya_A2025ActionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019c6bfb-bafb-741d-a154-a6bd9ca0b311" xlink:to="loc_kelya_A2025ActionsMember_019c6bfb-bafb-78c9-b306-a2b7eec9c2fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommunicationsAndInformationTechnology_019c6bfb-bafb-7626-9622-8e0c83e57136" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommunicationsAndInformationTechnology"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c6bfb-bafb-713c-99ae-652c47459864" xlink:to="loc_us-gaap_CommunicationsAndInformationTechnology_019c6bfb-bafb-7626-9622-8e0c83e57136" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeveranceCosts1_019c6bfb-bafb-7e32-9675-55cc597e1a5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeveranceCosts1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c6bfb-bafb-713c-99ae-652c47459864" xlink:to="loc_us-gaap_SeveranceCosts1_019c6bfb-bafb-7e32-9675-55cc597e1a5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringCosts_019c6bfb-bafb-7cc5-88b0-a46ed7ca5c7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherRestructuringCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c6bfb-bafb-713c-99ae-652c47459864" xlink:to="loc_us-gaap_OtherRestructuringCosts_019c6bfb-bafb-7cc5-88b0-a46ed7ca5c7b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TangibleAssetImpairmentCharges_019dd575-71d1-7148-ace4-b519288b8fe4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TangibleAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c6bfb-bafb-713c-99ae-652c47459864" xlink:to="loc_us-gaap_TangibleAssetImpairmentCharges_019dd575-71d1-7148-ace4-b519288b8fe4" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/IntegrationRealignmentandRestructuringScheduleofRestructuringandRelatedCostsDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#IntegrationRealignmentandRestructuringScheduleofRestructuringandRelatedCostsDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/IntegrationRealignmentandRestructuringScheduleofRestructuringandRelatedCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_019c6bfb-bafb-7f11-8ec6-152915780043" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c6bfb-bafb-70e5-ac45-17a92e723067" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c6bfb-bafb-7f11-8ec6-152915780043" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c6bfb-bafb-70e5-ac45-17a92e723067" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019c6bfb-bafb-773a-ae12-b89b78efa241" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c6bfb-bafb-70e5-ac45-17a92e723067" xlink:to="loc_srt_ConsolidationItemsAxis_019c6bfb-bafb-773a-ae12-b89b78efa241" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c6bfb-bafb-773a-ae12-b89b78efa241_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019c6bfb-bafb-773a-ae12-b89b78efa241" xlink:to="loc_srt_ConsolidationItemsDomain_019c6bfb-bafb-773a-ae12-b89b78efa241_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c6bfb-bafb-7e1b-8464-403e517c0eb0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019c6bfb-bafb-773a-ae12-b89b78efa241" xlink:to="loc_srt_ConsolidationItemsDomain_019c6bfb-bafb-7e1b-8464-403e517c0eb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019c6bfb-bafb-70e3-abb8-994445f80f1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c6bfb-bafb-7e1b-8464-403e517c0eb0" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019c6bfb-bafb-70e3-abb8-994445f80f1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bafb-7deb-94ba-c2e63b47e6c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c6bfb-bafb-70e5-ac45-17a92e723067" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bafb-7deb-94ba-c2e63b47e6c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c6bfb-bafb-7deb-94ba-c2e63b47e6c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bafb-7deb-94ba-c2e63b47e6c0" xlink:to="loc_us-gaap_SegmentDomain_019c6bfb-bafb-7deb-94ba-c2e63b47e6c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c6bfb-bafb-722e-b4b9-de8c87754262" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bafb-7deb-94ba-c2e63b47e6c0" xlink:to="loc_us-gaap_SegmentDomain_019c6bfb-bafb-722e-b4b9-de8c87754262" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_EnterpriseTalentManagementMember_019c6bfb-bafb-7f67-986b-e098f445309d" xlink:href="kelya-20260329.xsd#kelya_EnterpriseTalentManagementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c6bfb-bafb-722e-b4b9-de8c87754262" xlink:to="loc_kelya_EnterpriseTalentManagementMember_019c6bfb-bafb-7f67-986b-e098f445309d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_ScienceEngineeringTechnologyMember_019c6bfb-bafb-72ca-9d0e-8ff6b2a9fe54" xlink:href="kelya-20260329.xsd#kelya_ScienceEngineeringTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c6bfb-bafb-722e-b4b9-de8c87754262" xlink:to="loc_kelya_ScienceEngineeringTechnologyMember_019c6bfb-bafb-72ca-9d0e-8ff6b2a9fe54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_EducationMember_019c6bfb-bafb-7686-97ed-a49bce73f300" xlink:href="kelya-20260329.xsd#kelya_EducationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c6bfb-bafb-722e-b4b9-de8c87754262" xlink:to="loc_kelya_EducationMember_019c6bfb-bafb-7686-97ed-a49bce73f300" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_019c6bfb-bafb-788f-b498-cf1fc2aacbe8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_019c6bfb-bafb-70e5-ac45-17a92e723067" xlink:to="loc_us-gaap_RestructuringPlanAxis_019c6bfb-bafb-788f-b498-cf1fc2aacbe8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019c6bfb-bafb-788f-b498-cf1fc2aacbe8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_019c6bfb-bafb-788f-b498-cf1fc2aacbe8" xlink:to="loc_us-gaap_RestructuringPlanDomain_019c6bfb-bafb-788f-b498-cf1fc2aacbe8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_019c6bfb-bafb-7f0b-a31a-e9af6d71d1aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_019c6bfb-bafb-788f-b498-cf1fc2aacbe8" xlink:to="loc_us-gaap_RestructuringPlanDomain_019c6bfb-bafb-7f0b-a31a-e9af6d71d1aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_A2026ActionsMember_019dd01a-9d96-7c9a-9c52-f0a9f2dd6637" xlink:href="kelya-20260329.xsd#kelya_A2026ActionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019c6bfb-bafb-7f0b-a31a-e9af6d71d1aa" xlink:to="loc_kelya_A2026ActionsMember_019dd01a-9d96-7c9a-9c52-f0a9f2dd6637" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_A2025ActionsMember_019c6bfb-bafb-7028-bf7d-2d94a005b1f4" xlink:href="kelya-20260329.xsd#kelya_A2025ActionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_019c6bfb-bafb-7f0b-a31a-e9af6d71d1aa" xlink:to="loc_kelya_A2025ActionsMember_019c6bfb-bafb-7028-bf7d-2d94a005b1f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommunicationsAndInformationTechnology_019c6bfb-bafb-740c-8a94-6f22a76cab9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommunicationsAndInformationTechnology"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c6bfb-bafb-7f11-8ec6-152915780043" xlink:to="loc_us-gaap_CommunicationsAndInformationTechnology_019c6bfb-bafb-740c-8a94-6f22a76cab9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeveranceCosts1_019c6bfb-bafb-7974-9258-2c8cbe96af20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeveranceCosts1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c6bfb-bafb-7f11-8ec6-152915780043" xlink:to="loc_us-gaap_SeveranceCosts1_019c6bfb-bafb-7974-9258-2c8cbe96af20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringCosts_019c6bfb-bafb-7e6a-be34-9798ed826e3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherRestructuringCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c6bfb-bafb-7f11-8ec6-152915780043" xlink:to="loc_us-gaap_OtherRestructuringCosts_019c6bfb-bafb-7e6a-be34-9798ed826e3d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_019c6bfb-bafb-7358-be6c-4b9431a7f75f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_019c6bfb-bafb-7f11-8ec6-152915780043" xlink:to="loc_us-gaap_RestructuringCharges_019c6bfb-bafb-7358-be6c-4b9431a7f75f" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/DebtDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#DebtDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/DebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019c6bfb-bafb-7dc0-a440-26942a62e6e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019c6bfb-bafb-7c7c-920e-3606aad24ca6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c6bfb-bafb-7dc0-a440-26942a62e6e9" xlink:to="loc_us-gaap_DebtInstrumentTable_019c6bfb-bafb-7c7c-920e-3606aad24ca6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019c6bfb-bafb-7a20-9d29-c42042552077" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c6bfb-bafb-7c7c-920e-3606aad24ca6" xlink:to="loc_us-gaap_DebtInstrumentAxis_019c6bfb-bafb-7a20-9d29-c42042552077" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c6bfb-bafb-7a20-9d29-c42042552077_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c6bfb-bafb-7a20-9d29-c42042552077" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c6bfb-bafb-7a20-9d29-c42042552077_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019c6bfb-bafb-7152-81b0-4552cd0b4bd8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019c6bfb-bafb-7a20-9d29-c42042552077" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019c6bfb-bafb-7152-81b0-4552cd0b4bd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_TheFacilityMember_019c6bfb-bafb-7e86-83c8-b413295e4d27" xlink:href="kelya-20260329.xsd#kelya_TheFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c6bfb-bafb-7152-81b0-4552cd0b4bd8" xlink:to="loc_kelya_TheFacilityMember_019c6bfb-bafb-7e86-83c8-b413295e4d27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_SecuritizationFacilityMember_019c6bfb-bafb-7ebe-ac15-0defbd832717" xlink:href="kelya-20260329.xsd#kelya_SecuritizationFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c6bfb-bafb-7152-81b0-4552cd0b4bd8" xlink:to="loc_kelya_SecuritizationFacilityMember_019c6bfb-bafb-7ebe-ac15-0defbd832717" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_UnsecuredUncommittedShortTermLocalCreditFacilitiesMember_019c6bfb-bafb-7214-9b65-14040d286e46" xlink:href="kelya-20260329.xsd#kelya_UnsecuredUncommittedShortTermLocalCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019c6bfb-bafb-7152-81b0-4552cd0b4bd8" xlink:to="loc_kelya_UnsecuredUncommittedShortTermLocalCreditFacilitiesMember_019c6bfb-bafb-7214-9b65-14040d286e46" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019c6bfb-bafb-7b10-9ffb-fd6b3c2805bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c6bfb-bafb-7c7c-920e-3606aad24ca6" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019c6bfb-bafb-7b10-9ffb-fd6b3c2805bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c6bfb-bafb-7b10-9ffb-fd6b3c2805bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c6bfb-bafb-7b10-9ffb-fd6b3c2805bd" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c6bfb-bafb-7b10-9ffb-fd6b3c2805bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019c6bfb-bafb-77b0-86a3-796845b6ab31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019c6bfb-bafb-7b10-9ffb-fd6b3c2805bd" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019c6bfb-bafb-77b0-86a3-796845b6ab31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019c6bfb-bafb-78f6-96b9-7551c371afbf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019c6bfb-bafb-77b0-86a3-796845b6ab31" xlink:to="loc_us-gaap_LineOfCreditMember_019c6bfb-bafb-78f6-96b9-7551c371afbf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NatureOfExpenseAxis_019c6bfb-bafb-7e57-8e99-e1001cc306c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NatureOfExpenseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c6bfb-bafb-7c7c-920e-3606aad24ca6" xlink:to="loc_us-gaap_NatureOfExpenseAxis_019c6bfb-bafb-7e57-8e99-e1001cc306c0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_019c6bfb-bafb-7e57-8e99-e1001cc306c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterimPeriodCostsNotAllocableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_NatureOfExpenseAxis_019c6bfb-bafb-7e57-8e99-e1001cc306c0" xlink:to="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_019c6bfb-bafb-7e57-8e99-e1001cc306c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_019c6bfb-bafb-71b9-86f2-4720aa49027a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterimPeriodCostsNotAllocableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_NatureOfExpenseAxis_019c6bfb-bafb-7e57-8e99-e1001cc306c0" xlink:to="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_019c6bfb-bafb-71b9-86f2-4720aa49027a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_FacilityFeeMember_019c6bfb-bafb-74d3-8019-5106655e0a4a" xlink:href="kelya-20260329.xsd#kelya_FacilityFeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterimPeriodCostsNotAllocableDomain_019c6bfb-bafb-71b9-86f2-4720aa49027a" xlink:to="loc_kelya_FacilityFeeMember_019c6bfb-bafb-74d3-8019-5106655e0a4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019c6bfb-bafb-7160-b296-da7f62242f68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c6bfb-bafb-7c7c-920e-3606aad24ca6" xlink:to="loc_us-gaap_CreditFacilityAxis_019c6bfb-bafb-7160-b296-da7f62242f68" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c6bfb-bafb-7160-b296-da7f62242f68_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019c6bfb-bafb-7160-b296-da7f62242f68" xlink:to="loc_us-gaap_CreditFacilityDomain_019c6bfb-bafb-7160-b296-da7f62242f68_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019c6bfb-bafb-7552-9558-55a65d3c5428" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019c6bfb-bafb-7160-b296-da7f62242f68" xlink:to="loc_us-gaap_CreditFacilityDomain_019c6bfb-bafb-7552-9558-55a65d3c5428" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_StandbyLetterOfCreditRelatedToWorkersCompensationMember_019c6bfb-bafb-745c-a355-8dc4f791d791" xlink:href="kelya-20260329.xsd#kelya_StandbyLetterOfCreditRelatedToWorkersCompensationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019c6bfb-bafb-7552-9558-55a65d3c5428" xlink:to="loc_kelya_StandbyLetterOfCreditRelatedToWorkersCompensationMember_019c6bfb-bafb-745c-a355-8dc4f791d791" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019c6bfb-bafb-71f6-a62a-85f75ad3d0a8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019c6bfb-bafb-7c7c-920e-3606aad24ca6" xlink:to="loc_srt_StatementScenarioAxis_019c6bfb-bafb-71f6-a62a-85f75ad3d0a8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019c6bfb-bafb-71f6-a62a-85f75ad3d0a8_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019c6bfb-bafb-71f6-a62a-85f75ad3d0a8" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019c6bfb-bafb-71f6-a62a-85f75ad3d0a8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019c6bfb-bafb-7a0f-902a-1701a14f5645" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019c6bfb-bafb-71f6-a62a-85f75ad3d0a8" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019c6bfb-bafb-7a0f-902a-1701a14f5645" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019c6bfb-bafb-75ac-a9cf-4fc1aa42f280" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019c6bfb-bafb-7a0f-902a-1701a14f5645" xlink:to="loc_srt_ScenarioForecastMember_019c6bfb-bafb-75ac-a9cf-4fc1aa42f280" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019c6bfb-bafb-7c30-b56e-fe74c1370ffb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c6bfb-bafb-7dc0-a440-26942a62e6e9" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019c6bfb-bafb-7c30-b56e-fe74c1370ffb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019c6bfb-bafb-70ed-8399-f3f238f18c85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c6bfb-bafb-7dc0-a440-26942a62e6e9" xlink:to="loc_us-gaap_DebtInstrumentTerm_019c6bfb-bafb-70ed-8399-f3f238f18c85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019c6bfb-bafb-7dc7-8540-38530209351d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c6bfb-bafb-7dc0-a440-26942a62e6e9" xlink:to="loc_us-gaap_LongTermDebt_019c6bfb-bafb-7dc7-8540-38530209351d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019c6bfb-bafb-7a28-91d4-acf76baa6044" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c6bfb-bafb-7dc0-a440-26942a62e6e9" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019c6bfb-bafb-7a28-91d4-acf76baa6044" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019c6bfb-bafb-77aa-b44f-24fd1e7c421e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c6bfb-bafb-7dc0-a440-26942a62e6e9" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019c6bfb-bafb-77aa-b44f-24fd1e7c421e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_019c6bfb-bafb-7271-a0f1-691c6533c015" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c6bfb-bafb-7dc0-a440-26942a62e6e9" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_019c6bfb-bafb-7271-a0f1-691c6533c015" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019c6bfb-bafb-7973-8160-54ce667d554b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c6bfb-bafb-7dc0-a440-26942a62e6e9" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019c6bfb-bafb-7973-8160-54ce667d554b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_DebtInstrumentInterestRateUtilization_019c6bfb-bafb-7dcf-a83c-d0cb1c285d20" xlink:href="kelya-20260329.xsd#kelya_DebtInstrumentInterestRateUtilization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c6bfb-bafb-7dc0-a440-26942a62e6e9" xlink:to="loc_kelya_DebtInstrumentInterestRateUtilization_019c6bfb-bafb-7dcf-a83c-d0cb1c285d20" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_019c6bfb-bafb-7d09-82e0-fcbbcef81111" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c6bfb-bafb-7dc0-a440-26942a62e6e9" xlink:to="loc_us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd_019c6bfb-bafb-7d09-82e0-fcbbcef81111" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_019c6bfb-bafb-7796-b97d-33d24c6d022c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019c6bfb-bafb-7dc0-a440-26942a62e6e9" xlink:to="loc_us-gaap_ShortTermBorrowings_019c6bfb-bafb-7796-b97d-33d24c6d022c" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofAccumulatedOtherComprehensiveIncomeLossbyComponentNetofTaxDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#AccumulatedOtherComprehensiveIncomeLossScheduleofAccumulatedOtherComprehensiveIncomeLossbyComponentNetofTaxDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofAccumulatedOtherComprehensiveIncomeLossbyComponentNetofTaxDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c6bfb-bafb-7cd1-9bab-259f772eed82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c6bfb-bafb-7f1f-af14-518c2dd74141" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c6bfb-bafb-7cd1-9bab-259f772eed82" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c6bfb-bafb-7f1f-af14-518c2dd74141" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c6bfb-bafb-72d8-be61-8e5406d15431" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019c6bfb-bafb-7f1f-af14-518c2dd74141" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c6bfb-bafb-72d8-be61-8e5406d15431" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c6bfb-bafb-72d8-be61-8e5406d15431_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c6bfb-bafb-72d8-be61-8e5406d15431" xlink:to="loc_us-gaap_EquityComponentDomain_019c6bfb-bafb-72d8-be61-8e5406d15431_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c6bfb-bafb-7b44-ad6c-7e084f5f4d59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c6bfb-bafb-72d8-be61-8e5406d15431" xlink:to="loc_us-gaap_EquityComponentDomain_019c6bfb-bafb-7b44-ad6c-7e084f5f4d59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c6bfb-bafb-795d-83e4-09e2d65fc07d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c6bfb-bafb-7b44-ad6c-7e084f5f4d59" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019c6bfb-bafb-795d-83e4-09e2d65fc07d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c6bfb-bafb-7790-a44a-fab43b83e94d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c6bfb-bafb-7b44-ad6c-7e084f5f4d59" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c6bfb-bafb-7790-a44a-fab43b83e94d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019c6bfb-bafb-7a07-9050-a4645c5075f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019c6bfb-bafb-7cd1-9bab-259f772eed82" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019c6bfb-bafb-7a07-9050-a4645c5075f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019c6bfb-bafb-7338-89a3-4ac7689ce253" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019c6bfb-bafb-7a07-9050-a4645c5075f8" xlink:to="loc_us-gaap_StockholdersEquity_019c6bfb-bafb-7338-89a3-4ac7689ce253" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_019c6bfb-bafb-7954-ba6e-07e37218ad60" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019c6bfb-bafb-7a07-9050-a4645c5075f8" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_019c6bfb-bafb-7954-ba6e-07e37218ad60" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_019c6bfb-bafb-7120-ba66-c24cf1990484" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019c6bfb-bafb-7a07-9050-a4645c5075f8" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_019c6bfb-bafb-7120-ba66-c24cf1990484" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019c6bfb-bafb-7694-960f-bb8a289679a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_019c6bfb-bafb-7a07-9050-a4645c5075f8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019c6bfb-bafb-7694-960f-bb8a289679a8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019c6bfb-bafb-7586-b94a-0ae80da946bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/EarningsLossPerShareNarrativeDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#EarningsLossPerShareNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/EarningsLossPerShareNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableLineItems_019c6bfb-bafb-7c6b-8a26-71edd9418c6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsPayableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableTable_019c6bfb-bafb-7349-9bfe-ef33fe6b36a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsPayableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DividendsPayableLineItems_019c6bfb-bafb-7c6b-8a26-71edd9418c6a" xlink:to="loc_us-gaap_DividendsPayableTable_019c6bfb-bafb-7349-9bfe-ef33fe6b36a3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-bafb-7219-939b-6c1d84d120a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DividendsPayableTable_019c6bfb-bafb-7349-9bfe-ef33fe6b36a3" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-bafb-7219-939b-6c1d84d120a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafb-7219-939b-6c1d84d120a2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-bafb-7219-939b-6c1d84d120a2" xlink:to="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafb-7219-939b-6c1d84d120a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafb-7a40-a8e1-c2c146e7cb7d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c6bfb-bafb-7219-939b-6c1d84d120a2" xlink:to="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafb-7a40-a8e1-c2c146e7cb7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c6bfb-bafb-7913-92a7-57c6180e54f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafb-7a40-a8e1-c2c146e7cb7d" xlink:to="loc_us-gaap_CommonClassAMember_019c6bfb-bafb-7913-92a7-57c6180e54f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c6bfb-bafb-7ba3-b07e-1fc5876c8c5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c6bfb-bafb-7a40-a8e1-c2c146e7cb7d" xlink:to="loc_us-gaap_CommonClassBMember_019c6bfb-bafb-7ba3-b07e-1fc5876c8c5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019c6bfb-bafb-733e-aaf4-5a88864fd7da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsPayableLineItems_019c6bfb-bafb-7c6b-8a26-71edd9418c6a" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019c6bfb-bafb-733e-aaf4-5a88864fd7da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019c6bfb-bafb-749c-8573-58ce298af0df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareCashPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsPayableLineItems_019c6bfb-bafb-7c6b-8a26-71edd9418c6a" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_019c6bfb-bafb-749c-8573-58ce298af0df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019c6bfb-bafb-714b-8314-21a36efd4c4e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsPayableLineItems_019c6bfb-bafb-7c6b-8a26-71edd9418c6a" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019c6bfb-bafb-714b-8314-21a36efd4c4e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019c6bfb-bafb-7efb-b29c-c8cb5404d963" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsPayableLineItems_019c6bfb-bafb-7c6b-8a26-71edd9418c6a" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019c6bfb-bafb-7efb-b29c-c8cb5404d963" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019c6bfb-bafb-745f-a727-98e364544f26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsPayableLineItems_019c6bfb-bafb-7c6b-8a26-71edd9418c6a" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_019c6bfb-bafb-745f-a727-98e364544f26" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/StockBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#StockBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-77ac-8ee3-418d44619871" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c6bfb-bafb-7f93-b5ab-472ddbfda404" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-77ac-8ee3-418d44619871" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c6bfb-bafb-7f93-b5ab-472ddbfda404" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c6bfb-bafb-7e39-ba12-f930fed6580f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c6bfb-bafb-7f93-b5ab-472ddbfda404" xlink:to="loc_us-gaap_AwardTypeAxis_019c6bfb-bafb-7e39-ba12-f930fed6580f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-7e39-ba12-f930fed6580f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c6bfb-bafb-7e39-ba12-f930fed6580f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-7e39-ba12-f930fed6580f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-778c-b752-d61684e6c409" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c6bfb-bafb-7e39-ba12-f930fed6580f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-778c-b752-d61684e6c409" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_019c6bfb-bafb-7e6e-b9f1-1441e54a4783" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-778c-b752-d61684e6c409" xlink:to="loc_us-gaap_PerformanceSharesMember_019c6bfb-bafb-7e6e-b9f1-1441e54a4783" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c6bfb-bafb-7cbe-874c-f242271e022e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-77ac-8ee3-418d44619871" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c6bfb-bafb-7cbe-874c-f242271e022e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019c6bfb-bafb-7053-a109-51d89a10613b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-77ac-8ee3-418d44619871" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_019c6bfb-bafb-7053-a109-51d89a10613b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_ShareBasedPaymentArrangementMaximumNumberOfSharesThatCanBeEarnedPercentage_019c6bfb-bafb-7ca4-a6cb-1e9ec9713203" xlink:href="kelya-20260329.xsd#kelya_ShareBasedPaymentArrangementMaximumNumberOfSharesThatCanBeEarnedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-77ac-8ee3-418d44619871" xlink:to="loc_kelya_ShareBasedPaymentArrangementMaximumNumberOfSharesThatCanBeEarnedPercentage_019c6bfb-bafb-7ca4-a6cb-1e9ec9713203" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPerformancePeriods_019c6bfb-bafb-7fdf-893b-c997247f2754" xlink:href="kelya-20260329.xsd#kelya_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPerformancePeriods"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-77ac-8ee3-418d44619871" xlink:to="loc_kelya_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPerformancePeriods_019c6bfb-bafb-7fdf-893b-c997247f2754" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod_019c6bfb-bafb-7e21-a222-095b252fbd3c" xlink:href="kelya-20260329.xsd#kelya_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-77ac-8ee3-418d44619871" xlink:to="loc_kelya_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod_019c6bfb-bafb-7e21-a222-095b252fbd3c" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/StockBasedCompensationScheduleofNonvestedRestrictedStockDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#StockBasedCompensationScheduleofNonvestedRestrictedStockDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/StockBasedCompensationScheduleofNonvestedRestrictedStockDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-72d9-98b5-da8e45364eb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c6bfb-bafb-70ea-a9ac-546ec9797ce2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-72d9-98b5-da8e45364eb9" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c6bfb-bafb-70ea-a9ac-546ec9797ce2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c6bfb-bafb-78f0-8cbf-2eb1b553097f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c6bfb-bafb-70ea-a9ac-546ec9797ce2" xlink:to="loc_us-gaap_AwardTypeAxis_019c6bfb-bafb-78f0-8cbf-2eb1b553097f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-78f0-8cbf-2eb1b553097f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c6bfb-bafb-78f0-8cbf-2eb1b553097f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-78f0-8cbf-2eb1b553097f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-762a-b6b2-dc5086b01e65" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c6bfb-bafb-78f0-8cbf-2eb1b553097f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-762a-b6b2-dc5086b01e65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019c6bfb-bafb-751b-9b96-0aeab67b653a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-762a-b6b2-dc5086b01e65" xlink:to="loc_us-gaap_RestrictedStockMember_019c6bfb-bafb-751b-9b96-0aeab67b653a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c6bfb-bafb-7588-a0cb-e52977d4fe65" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-72d9-98b5-da8e45364eb9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c6bfb-bafb-7588-a0cb-e52977d4fe65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019c6bfb-bafb-7073-b9b8-33989f88a219" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c6bfb-bafb-7588-a0cb-e52977d4fe65" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019c6bfb-bafb-7073-b9b8-33989f88a219" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019c6bfb-bafb-7c73-839c-21c498edc752" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c6bfb-bafb-7588-a0cb-e52977d4fe65" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019c6bfb-bafb-7c73-839c-21c498edc752" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019c6bfb-bafb-7bf0-822b-9a848d616ed6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c6bfb-bafb-7588-a0cb-e52977d4fe65" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019c6bfb-bafb-7bf0-822b-9a848d616ed6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019c6bfb-bafb-719d-9820-b1d9f91fa478" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c6bfb-bafb-7588-a0cb-e52977d4fe65" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019c6bfb-bafb-719d-9820-b1d9f91fa478" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019c6bfb-bafb-7c18-b645-59ae1a7f0047" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c6bfb-bafb-744f-a515-c1835d36dc73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-72d9-98b5-da8e45364eb9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c6bfb-bafb-744f-a515-c1835d36dc73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019c6bfb-bafb-7f7e-8747-b1fda95c6861" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c6bfb-bafb-744f-a515-c1835d36dc73" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019c6bfb-bafb-7f7e-8747-b1fda95c6861" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019c6bfb-bafb-7051-b014-fc172a5f9cb6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c6bfb-bafb-744f-a515-c1835d36dc73" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019c6bfb-bafb-7051-b014-fc172a5f9cb6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019c6bfb-bafb-78d8-ac50-27dcbe4d452a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c6bfb-bafb-744f-a515-c1835d36dc73" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019c6bfb-bafb-78d8-ac50-27dcbe4d452a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019c6bfb-bafb-784f-8105-531d25d0503b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c6bfb-bafb-744f-a515-c1835d36dc73" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019c6bfb-bafb-784f-8105-531d25d0503b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019c6bfb-bafb-7d5d-a43a-0112989420c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/StockBasedCompensationScheduleofNonvestedPerformanceSharesDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#StockBasedCompensationScheduleofNonvestedPerformanceSharesDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/StockBasedCompensationScheduleofNonvestedPerformanceSharesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-7ff8-b18a-7dc1f389133e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c6bfb-bafb-7075-9eb7-dd742074eb64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-7ff8-b18a-7dc1f389133e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c6bfb-bafb-7075-9eb7-dd742074eb64" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c6bfb-bafb-7080-bd22-bceef3fdaed9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c6bfb-bafb-7075-9eb7-dd742074eb64" xlink:to="loc_us-gaap_AwardTypeAxis_019c6bfb-bafb-7080-bd22-bceef3fdaed9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-7080-bd22-bceef3fdaed9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c6bfb-bafb-7080-bd22-bceef3fdaed9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-7080-bd22-bceef3fdaed9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-7c93-8db9-5473447b9bfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c6bfb-bafb-7080-bd22-bceef3fdaed9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-7c93-8db9-5473447b9bfa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_PerformanceSharesFinancialMeasureMember_019c6bfb-bafb-7b27-9e7f-e2d7f9cea18e" xlink:href="kelya-20260329.xsd#kelya_PerformanceSharesFinancialMeasureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c6bfb-bafb-7c93-8db9-5473447b9bfa" xlink:to="loc_kelya_PerformanceSharesFinancialMeasureMember_019c6bfb-bafb-7b27-9e7f-e2d7f9cea18e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c6bfb-bafb-7fce-81d3-90ecced2980e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-7ff8-b18a-7dc1f389133e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c6bfb-bafb-7fce-81d3-90ecced2980e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019c6bfb-bafb-7bf5-873a-37d5227b5c64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c6bfb-bafb-7fce-81d3-90ecced2980e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019c6bfb-bafb-7bf5-873a-37d5227b5c64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019c6bfb-bafb-703b-a615-9f7f6ca6e211" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c6bfb-bafb-7fce-81d3-90ecced2980e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019c6bfb-bafb-703b-a615-9f7f6ca6e211" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019c6bfb-bafb-7bdc-9b53-28e118630c78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c6bfb-bafb-7fce-81d3-90ecced2980e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019c6bfb-bafb-7bdc-9b53-28e118630c78" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019c6bfb-bafb-7455-a2ba-2bf2372155bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c6bfb-bafb-7fce-81d3-90ecced2980e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019c6bfb-bafb-7455-a2ba-2bf2372155bc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingAdjustment_019c6bfb-bafb-713b-bca5-75e5b943db8f" xlink:href="kelya-20260329.xsd#kelya_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c6bfb-bafb-7fce-81d3-90ecced2980e" xlink:to="loc_kelya_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingAdjustment_019c6bfb-bafb-713b-bca5-75e5b943db8f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019c6bfb-bafb-74b4-9b8e-bff8b02f21ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c6bfb-bafb-79f4-8a76-a606e8db2e47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c6bfb-bafb-7ff8-b18a-7dc1f389133e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c6bfb-bafb-79f4-8a76-a606e8db2e47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019c6bfb-bafb-7ee4-b7e2-911df7355a1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c6bfb-bafb-79f4-8a76-a606e8db2e47" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019c6bfb-bafb-7ee4-b7e2-911df7355a1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019c6bfb-bafb-7824-8163-9f580b1f901f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c6bfb-bafb-79f4-8a76-a606e8db2e47" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019c6bfb-bafb-7824-8163-9f580b1f901f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019c6bfb-bafb-7bdd-8e0b-610218e1e203" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c6bfb-bafb-79f4-8a76-a606e8db2e47" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019c6bfb-bafb-7bdd-8e0b-610218e1e203" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019c6bfb-bafb-7dfa-98b6-ade966f86318" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c6bfb-bafb-79f4-8a76-a606e8db2e47" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019c6bfb-bafb-7dfa-98b6-ade966f86318" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingAdjustmentWeightedAverageGrantDateFairValue_019c6bfb-bafb-79c9-98c5-d1d9cfae9dc4" xlink:href="kelya-20260329.xsd#kelya_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingAdjustmentWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c6bfb-bafb-79f4-8a76-a606e8db2e47" xlink:to="loc_kelya_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestingAdjustmentWeightedAverageGrantDateFairValue_019c6bfb-bafb-79c9-98c5-d1d9cfae9dc4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019c6bfb-bafb-71b9-b5dd-b9da966f7081" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/ContingenciesNarrativeDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#ContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/ContingenciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019c6bfb-bba0-756b-8342-39b2c2fff01f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019c6bfb-bba0-799a-b2f8-5860bad1ea14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c6bfb-bba0-756b-8342-39b2c2fff01f" xlink:to="loc_us-gaap_LossContingenciesTable_019c6bfb-bba0-799a-b2f8-5860bad1ea14" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c6bfb-bba0-7660-a930-8fe7f6d9e2b8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019c6bfb-bba0-799a-b2f8-5860bad1ea14" xlink:to="loc_srt_RangeAxis_019c6bfb-bba0-7660-a930-8fe7f6d9e2b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c6bfb-bba0-7660-a930-8fe7f6d9e2b8_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c6bfb-bba0-7660-a930-8fe7f6d9e2b8" xlink:to="loc_srt_RangeMember_019c6bfb-bba0-7660-a930-8fe7f6d9e2b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c6bfb-bba0-7e87-994f-b22d13b29e42" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c6bfb-bba0-7660-a930-8fe7f6d9e2b8" xlink:to="loc_srt_RangeMember_019c6bfb-bba0-7e87-994f-b22d13b29e42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c6bfb-bba0-75d6-82fe-c7ff1a25fd1b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c6bfb-bba0-7e87-994f-b22d13b29e42" xlink:to="loc_srt_MinimumMember_019c6bfb-bba0-75d6-82fe-c7ff1a25fd1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c6bfb-bba0-7a25-939d-59a2bcc56a8d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c6bfb-bba0-7e87-994f-b22d13b29e42" xlink:to="loc_srt_MaximumMember_019c6bfb-bba0-7a25-939d-59a2bcc56a8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_019c6bfb-bba0-737e-8419-69e6ca2ea6ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyAccrualAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c6bfb-bba0-756b-8342-39b2c2fff01f" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_019c6bfb-bba0-737e-8419-69e6ca2ea6ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimatedInsuranceRecoveries_019c6bfb-bba0-7e6b-91f0-0e2d3bde3061" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimatedInsuranceRecoveries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c6bfb-bba0-756b-8342-39b2c2fff01f" xlink:to="loc_us-gaap_EstimatedInsuranceRecoveries_019c6bfb-bba0-7e6b-91f0-0e2d3bde3061" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued_019c6bfb-bba0-74ff-a11a-d52a2674ee8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019c6bfb-bba0-756b-8342-39b2c2fff01f" xlink:to="loc_us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued_019c6bfb-bba0-74ff-a11a-d52a2674ee8a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/SegmentDisclosuresSegmentReportingDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#SegmentDisclosuresSegmentReportingDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/SegmentDisclosuresSegmentReportingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingRevenueReconcilingItemLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_019c6bfb-bba0-732e-b493-add8b64cfa50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_019c6bfb-bba0-732e-b493-add8b64cfa50" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bba0-7575-829a-45033a559b7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_019c6bfb-bba0-732e-b493-add8b64cfa50" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bba0-7575-829a-45033a559b7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7575-829a-45033a559b7e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bba0-7575-829a-45033a559b7e" xlink:to="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7575-829a-45033a559b7e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7a7f-8c31-68f676b31584" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bba0-7575-829a-45033a559b7e" xlink:to="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7a7f-8c31-68f676b31584" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_EnterpriseTalentManagementMember_019c6bfb-bba0-7a96-9eaf-1112fb1aaba5" xlink:href="kelya-20260329.xsd#kelya_EnterpriseTalentManagementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7a7f-8c31-68f676b31584" xlink:to="loc_kelya_EnterpriseTalentManagementMember_019c6bfb-bba0-7a96-9eaf-1112fb1aaba5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_ScienceEngineeringTechnologyMember_019c6bfb-bba0-75aa-84ee-65b885cf9562" xlink:href="kelya-20260329.xsd#kelya_ScienceEngineeringTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7a7f-8c31-68f676b31584" xlink:to="loc_kelya_ScienceEngineeringTechnologyMember_019c6bfb-bba0-75aa-84ee-65b885cf9562" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_EducationMember_019c6bfb-bba0-7137-8e54-563efcabd40a" xlink:href="kelya-20260329.xsd#kelya_EducationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7a7f-8c31-68f676b31584" xlink:to="loc_kelya_EducationMember_019c6bfb-bba0-7137-8e54-563efcabd40a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019c6bfb-bba0-78e9-99d0-f0d198a9329d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfRevenueFromSegmentsToConsolidatedTable_019c6bfb-bba0-732e-b493-add8b64cfa50" xlink:to="loc_srt_ConsolidationItemsAxis_019c6bfb-bba0-78e9-99d0-f0d198a9329d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c6bfb-bba0-78e9-99d0-f0d198a9329d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019c6bfb-bba0-78e9-99d0-f0d198a9329d" xlink:to="loc_srt_ConsolidationItemsDomain_019c6bfb-bba0-78e9-99d0-f0d198a9329d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019c6bfb-bba0-7530-bb09-f80b25a361b0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019c6bfb-bba0-78e9-99d0-f0d198a9329d" xlink:to="loc_srt_ConsolidationItemsDomain_019c6bfb-bba0-7530-bb09-f80b25a361b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019c6bfb-bba0-74f9-a012-4af680357a74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c6bfb-bba0-7530-bb09-f80b25a361b0" xlink:to="loc_us-gaap_OperatingSegmentsMember_019c6bfb-bba0-74f9-a012-4af680357a74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_019c6bfb-bba0-791c-8ec1-3ad7397c110a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c6bfb-bba0-7530-bb09-f80b25a361b0" xlink:to="loc_us-gaap_IntersegmentEliminationMember_019c6bfb-bba0-791c-8ec1-3ad7397c110a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019c6bfb-bba0-7fb5-ba28-ee6f114d2c07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019c6bfb-bba0-7530-bb09-f80b25a361b0" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019c6bfb-bba0-7fb5-ba28-ee6f114d2c07" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019c6bfb-bba0-7f30-a66a-5a31cd5984ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_us-gaap_Revenues_019c6bfb-bba0-7f30-a66a-5a31cd5984ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019c6bfb-bba0-75bd-8a16-8d48c468dbda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019c6bfb-bba0-75bd-8a16-8d48c468dbda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019dd029-0fac-74c0-ac58-8d4ab49afe53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_us-gaap_GrossProfit_019dd029-0fac-74c0-ac58-8d4ab49afe53" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostDirectLabor_019c6bfb-bba0-7041-80a2-b9043c7a820e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostDirectLabor"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_us-gaap_CostDirectLabor_019c6bfb-bba0-7041-80a2-b9043c7a820e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_019c6bfb-bba0-7012-b33d-08041acafbdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_019c6bfb-bba0-7012-b33d-08041acafbdf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_SellingGeneralAndAdministrativeExpenseAdjusted_019c6bfb-bba0-74d5-8975-83fa4228c376" xlink:href="kelya-20260329.xsd#kelya_SellingGeneralAndAdministrativeExpenseAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_kelya_SellingGeneralAndAdministrativeExpenseAdjusted_019c6bfb-bba0-74d5-8975-83fa4228c376" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetImpairmentCharges_019dd02a-f808-7d3d-b194-87adb698910c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_us-gaap_AssetImpairmentCharges_019dd02a-f808-7d3d-b194-87adb698910c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_BusinessUnitProfitLoss_019c6bfb-bba0-7b34-9f16-6cbecc00c38b" xlink:href="kelya-20260329.xsd#kelya_BusinessUnitProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_kelya_BusinessUnitProfitLoss_019c6bfb-bba0-7b34-9f16-6cbecc00c38b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019c6bfb-bba0-7989-bf91-5aa5d5eeb9b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019c6bfb-bba0-7989-bf91-5aa5d5eeb9b3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_DepreciationAndAmortizationIncludingHostedSoftwareImplementationCosts_019c6bfb-bba0-7f51-86f2-4d134dbe2f04" xlink:href="kelya-20260329.xsd#kelya_DepreciationAndAmortizationIncludingHostedSoftwareImplementationCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_kelya_DepreciationAndAmortizationIncludingHostedSoftwareImplementationCosts_019c6bfb-bba0-7f51-86f2-4d134dbe2f04" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019c6bfb-bba0-7cdd-8bc7-9408e8c5c6fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_us-gaap_OperatingIncomeLoss_019c6bfb-bba0-7cdd-8bc7-9408e8c5c6fb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019c6bfb-bba0-7054-8f78-7f73b6669778" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019c6bfb-bba0-7054-8f78-7f73b6669778" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c6bfb-bba0-7c4c-b41b-886eae5b2d30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingRevenueReconcilingItemLineItems_019c6bfb-bba0-727a-bd33-73d122a9d3bf" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c6bfb-bba0-7c4c-b41b-886eae5b2d30" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/SegmentDisclosuresDepreciationandAmortizationExpenseIncludedinSGAExpensesDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#SegmentDisclosuresDepreciationandAmortizationExpenseIncludedinSGAExpensesDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/SegmentDisclosuresDepreciationandAmortizationExpenseIncludedinSGAExpensesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c6bfb-bba0-755e-abb2-ca05184145a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_019c6bfb-bba0-7e9d-80a4-1e059ff0fdd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c6bfb-bba0-755e-abb2-ca05184145a5" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_019c6bfb-bba0-7e9d-80a4-1e059ff0fdd3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bba0-7636-bb01-68450eab8f38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_019c6bfb-bba0-7e9d-80a4-1e059ff0fdd3" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bba0-7636-bb01-68450eab8f38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7636-bb01-68450eab8f38_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bba0-7636-bb01-68450eab8f38" xlink:to="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7636-bb01-68450eab8f38_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7f36-ab30-39e7b66dbd1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c6bfb-bba0-7636-bb01-68450eab8f38" xlink:to="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7f36-ab30-39e7b66dbd1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_EnterpriseTalentManagementMember_019c6bfb-bba0-78ec-a138-4c4db2f7e6b0" xlink:href="kelya-20260329.xsd#kelya_EnterpriseTalentManagementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7f36-ab30-39e7b66dbd1f" xlink:to="loc_kelya_EnterpriseTalentManagementMember_019c6bfb-bba0-78ec-a138-4c4db2f7e6b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_ScienceEngineeringTechnologyMember_019c6bfb-bba0-7b4e-acdd-27b975a065dc" xlink:href="kelya-20260329.xsd#kelya_ScienceEngineeringTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7f36-ab30-39e7b66dbd1f" xlink:to="loc_kelya_ScienceEngineeringTechnologyMember_019c6bfb-bba0-7b4e-acdd-27b975a065dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_EducationMember_019c6bfb-bba0-74c2-a4af-892f8db37ddc" xlink:href="kelya-20260329.xsd#kelya_EducationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c6bfb-bba0-7f36-ab30-39e7b66dbd1f" xlink:to="loc_kelya_EducationMember_019c6bfb-bba0-74c2-a4af-892f8db37ddc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_DepreciationAndAmortizationIncludingHostedSoftwareImplementationCosts_019c6bfb-bba0-74f7-8926-979114c6843b" xlink:href="kelya-20260329.xsd#kelya_DepreciationAndAmortizationIncludingHostedSoftwareImplementationCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_019c6bfb-bba0-755e-abb2-ca05184145a5" xlink:to="loc_kelya_DepreciationAndAmortizationIncludingHostedSoftwareImplementationCosts_019c6bfb-bba0-74f7-8926-979114c6843b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019dd9ad-bc3c-743e-98ae-8f475d7cd4e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019dd9ad-bc3c-722b-b4a0-18cb4df5580f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dd9ad-bc3c-743e-98ae-8f475d7cd4e0" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019dd9ad-bc3c-722b-b4a0-18cb4df5580f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019dd9ad-bc3c-79a4-a548-3aeb045f46f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019dd9ad-bc3c-722b-b4a0-18cb4df5580f" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019dd9ad-bc3c-79a4-a548-3aeb045f46f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019dd9ad-bc3c-79a4-a548-3aeb045f46f6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019dd9ad-bc3c-79a4-a548-3aeb045f46f6" xlink:to="loc_us-gaap_RelatedPartyDomain_019dd9ad-bc3c-79a4-a548-3aeb045f46f6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019dd9ad-bc3c-73e3-b251-940c1d1e9bad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019dd9ad-bc3c-79a4-a548-3aeb045f46f6" xlink:to="loc_us-gaap_RelatedPartyDomain_019dd9ad-bc3c-73e3-b251-940c1d1e9bad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019dd9ae-2adb-7773-9753-2e2a5dd66cf0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019dd9ad-bc3c-73e3-b251-940c1d1e9bad" xlink:to="loc_us-gaap_RelatedPartyMember_019dd9ae-2adb-7773-9753-2e2a5dd66cf0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019dd9ba-6969-7650-9f09-b8dd53320e6e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019dd9ad-bc3c-722b-b4a0-18cb4df5580f" xlink:to="loc_dei_LegalEntityAxis_019dd9ba-6969-7650-9f09-b8dd53320e6e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019dd9ba-6969-7650-9f09-b8dd53320e6e_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019dd9ba-6969-7650-9f09-b8dd53320e6e" xlink:to="loc_dei_EntityDomain_019dd9ba-6969-7650-9f09-b8dd53320e6e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019dd9ba-6969-7f91-8ebd-77877429a983" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019dd9ba-6969-7650-9f09-b8dd53320e6e" xlink:to="loc_dei_EntityDomain_019dd9ba-6969-7f91-8ebd-77877429a983" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_TerenceE.AdderleyRevocableTrustKMember_019dd9bd-83fa-72b1-b137-a4b098ad35b5" xlink:href="kelya-20260329.xsd#kelya_TerenceE.AdderleyRevocableTrustKMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019dd9ba-6969-7f91-8ebd-77877429a983" xlink:to="loc_kelya_TerenceE.AdderleyRevocableTrustKMember_019dd9bd-83fa-72b1-b137-a4b098ad35b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_HuntEquityOpportunitiesLLCMember_019dd9bd-b63d-7b21-8846-ed5a0ce37d03" xlink:href="kelya-20260329.xsd#kelya_HuntEquityOpportunitiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019dd9ba-6969-7f91-8ebd-77877429a983" xlink:to="loc_kelya_HuntEquityOpportunitiesLLCMember_019dd9bd-b63d-7b21-8846-ed5a0ce37d03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_019dd9bb-0274-7502-b08f-dbce8ac08995" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019dd9ad-bc3c-722b-b4a0-18cb4df5580f" xlink:to="loc_srt_OwnershipAxis_019dd9bb-0274-7502-b08f-dbce8ac08995" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019dd9bb-0274-7502-b08f-dbce8ac08995_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_019dd9bb-0274-7502-b08f-dbce8ac08995" xlink:to="loc_srt_OwnershipDomain_019dd9bb-0274-7502-b08f-dbce8ac08995_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019dd9bb-0274-7c9f-bc53-d7359f703d62" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_019dd9bb-0274-7502-b08f-dbce8ac08995" xlink:to="loc_srt_OwnershipDomain_019dd9bb-0274-7c9f-bc53-d7359f703d62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_KellyServicesInc.Member_019dd9bb-712b-793b-a0c0-4eea85f638c6" xlink:href="kelya-20260329.xsd#kelya_KellyServicesInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_019dd9bb-0274-7c9f-bc53-d7359f703d62" xlink:to="loc_kelya_KellyServicesInc.Member_019dd9bb-712b-793b-a0c0-4eea85f638c6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019dd9bb-86a0-7400-ba2b-4a53abbf629f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019dd9ad-bc3c-722b-b4a0-18cb4df5580f" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019dd9bb-86a0-7400-ba2b-4a53abbf629f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019dd9bb-86a0-7400-ba2b-4a53abbf629f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019dd9bb-86a0-7400-ba2b-4a53abbf629f" xlink:to="loc_us-gaap_ClassOfStockDomain_019dd9bb-86a0-7400-ba2b-4a53abbf629f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019dd9bb-86a0-71bd-9557-863ee99648b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019dd9bb-86a0-7400-ba2b-4a53abbf629f" xlink:to="loc_us-gaap_ClassOfStockDomain_019dd9bb-86a0-71bd-9557-863ee99648b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019dd9bb-9761-7afc-8e93-9d61536b40f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019dd9bb-86a0-71bd-9557-863ee99648b1" xlink:to="loc_us-gaap_CommonClassBMember_019dd9bb-9761-7afc-8e93-9d61536b40f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019dd9be-4039-707e-80f6-e24e46a507c7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019dd9ad-bc3c-722b-b4a0-18cb4df5580f" xlink:to="loc_srt_CounterpartyNameAxis_019dd9be-4039-707e-80f6-e24e46a507c7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019dd9be-4039-707e-80f6-e24e46a507c7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019dd9be-4039-707e-80f6-e24e46a507c7" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019dd9be-4039-707e-80f6-e24e46a507c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019dd9be-4039-738d-8ce5-2786cb96d186" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019dd9be-4039-707e-80f6-e24e46a507c7" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019dd9be-4039-738d-8ce5-2786cb96d186" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_HuntEquityOpportunitiesLLCMember_019dd9be-4039-7843-a841-529bc1bd458f" xlink:href="kelya-20260329.xsd#kelya_HuntEquityOpportunitiesLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019dd9be-4039-738d-8ce5-2786cb96d186" xlink:to="loc_kelya_HuntEquityOpportunitiesLLCMember_019dd9be-4039-7843-a841-529bc1bd458f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction_019dd9bd-83fa-723e-b2f5-d77278571c0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dd9ad-bc3c-743e-98ae-8f475d7cd4e0" xlink:to="loc_us-gaap_SaleOfStockPercentageOfOwnershipBeforeTransaction_019dd9bd-83fa-723e-b2f5-d77278571c0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_019dd9bd-b63d-74bd-906b-fc6b98508fa6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dd9ad-bc3c-743e-98ae-8f475d7cd4e0" xlink:to="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_019dd9bd-b63d-74bd-906b-fc6b98508fa6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_SaleOfStockContingentConsiderationCashPayment_019dd9bd-d7ad-71d3-8d1b-77c229ea3df7" xlink:href="kelya-20260329.xsd#kelya_SaleOfStockContingentConsiderationCashPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dd9ad-bc3c-743e-98ae-8f475d7cd4e0" xlink:to="loc_kelya_SaleOfStockContingentConsiderationCashPayment_019dd9bd-d7ad-71d3-8d1b-77c229ea3df7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_SaleOfStockContingentConsiderationMinimumMarketCapitalization_019dd9be-18f2-7d2f-9f1d-db1470b23e50" xlink:href="kelya-20260329.xsd#kelya_SaleOfStockContingentConsiderationMinimumMarketCapitalization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dd9ad-bc3c-743e-98ae-8f475d7cd4e0" xlink:to="loc_kelya_SaleOfStockContingentConsiderationMinimumMarketCapitalization_019dd9be-18f2-7d2f-9f1d-db1470b23e50" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_kelya_SaleOfStockContingentConsiderationMarketCapitalizationMilestonePeriod_019dd9bd-f817-7bfd-b6ad-1b78d14ce922" xlink:href="kelya-20260329.xsd#kelya_SaleOfStockContingentConsiderationMarketCapitalizationMilestonePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dd9ad-bc3c-743e-98ae-8f475d7cd4e0" xlink:to="loc_kelya_SaleOfStockContingentConsiderationMarketCapitalizationMilestonePeriod_019dd9bd-f817-7bfd-b6ad-1b78d14ce922" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019dd9be-4039-79f9-ae8b-a2272b3cd2f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dd9ad-bc3c-743e-98ae-8f475d7cd4e0" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019dd9be-4039-79f9-ae8b-a2272b3cd2f3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction_019dd9be-66b3-7a2f-92cb-4f0c77b42945" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019dd9ad-bc3c-743e-98ae-8f475d7cd4e0" xlink:to="loc_us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction_019dd9be-66b3-7a2f-92cb-4f0c77b42945" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.kellyservices.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="kelya-20260329.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.kellyservices.com/role/SubsequentEventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019dd5f1-7d20-7f97-ae45-0fe2e40057d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019dd5f1-7d20-7a28-821a-e45956d691ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019dd5f1-7d20-7f97-ae45-0fe2e40057d8" xlink:to="loc_us-gaap_SubsequentEventTable_019dd5f1-7d20-7a28-821a-e45956d691ef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019dd5f1-7d20-7712-875c-df932486803c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019dd5f1-7d20-7a28-821a-e45956d691ef" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019dd5f1-7d20-7712-875c-df932486803c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dd5f1-7d20-7712-875c-df932486803c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dd5f1-7d20-7712-875c-df932486803c" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dd5f1-7d20-7712-875c-df932486803c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dd5f1-7d20-7d8c-91f9-1670ffd26789" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dd5f1-7d20-7712-875c-df932486803c" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dd5f1-7d20-7d8c-91f9-1670ffd26789" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019dd5f1-7d20-7bf3-a490-8d4a32d5b0d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019dd5f1-7d20-7d8c-91f9-1670ffd26789" xlink:to="loc_us-gaap_SubsequentEventMember_019dd5f1-7d20-7bf3-a490-8d4a32d5b0d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_019dd5f1-7d20-7744-9dcd-460b6d02f546" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019dd5f1-7d20-7f97-ae45-0fe2e40057d8" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_019dd5f1-7d20-7744-9dcd-460b6d02f546" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
