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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fd742-1996-735b-bec1-4f28a5306c1f,g:2b65a6ea-6cb9-4ece-9f77-7944923777fd-->
<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.gxo.com/role/Cover" xlink:type="simple" xlink:href="gxo-20261103.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.gxo.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019fd742-1996-7740-aa68-2b402e034cb1" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_DocumentInformationTable_019fd742-1996-7740-aa68-2b402e034cb1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019fd742-1996-753d-8278-e853c137722e" 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_019fd742-1996-7740-aa68-2b402e034cb1" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019fd742-1996-753d-8278-e853c137722e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019fd742-1996-753d-8278-e853c137722e_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_019fd742-1996-753d-8278-e853c137722e" xlink:to="loc_us-gaap_ClassOfStockDomain_019fd742-1996-753d-8278-e853c137722e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019fd742-1996-76fe-9b49-a6aab249939e" 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_019fd742-1996-753d-8278-e853c137722e" xlink:to="loc_us-gaap_ClassOfStockDomain_019fd742-1996-76fe-9b49-a6aab249939e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019fd742-1996-7a88-a448-95b6255a7244" 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_ClassOfStockDomain_019fd742-1996-76fe-9b49-a6aab249939e" xlink:to="loc_us-gaap_CommonStockMember_019fd742-1996-7a88-a448-95b6255a7244" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_gxo_A3.750NotesDue2030Member_019fd742-1996-7c61-842e-ca5194fafdb0" xlink:href="gxo-20261103.xsd#gxo_A3.750NotesDue2030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019fd742-1996-76fe-9b49-a6aab249939e" xlink:to="loc_gxo_A3.750NotesDue2030Member_019fd742-1996-7c61-842e-ca5194fafdb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019fd742-1996-7cfc-ae09-0056e57bfbaa" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_DocumentType_019fd742-1996-7cfc-ae09-0056e57bfbaa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019fd742-1996-7784-97e2-8da1151b100f" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_DocumentPeriodEndDate_019fd742-1996-7784-97e2-8da1151b100f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019fd742-1996-7bf2-bd63-30de70adb497" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_EntityRegistrantName_019fd742-1996-7bf2-bd63-30de70adb497" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019fd742-1996-7e6d-b74c-2a959584cadf" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019fd742-1996-7e6d-b74c-2a959584cadf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019fd742-1996-73f6-9bf1-ca4c95775c84" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_EntityFileNumber_019fd742-1996-73f6-9bf1-ca4c95775c84" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019fd742-1996-7331-a5d4-5a7bfe389a7e" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_EntityTaxIdentificationNumber_019fd742-1996-7331-a5d4-5a7bfe389a7e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019fd742-1996-7789-829b-ecaa2ee0814b" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_EntityAddressAddressLine1_019fd742-1996-7789-829b-ecaa2ee0814b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019fd742-1996-75c5-b681-2cbdda79131e" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_EntityAddressCityOrTown_019fd742-1996-75c5-b681-2cbdda79131e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019fd742-1996-79e7-9969-41628801de24" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_EntityAddressStateOrProvince_019fd742-1996-79e7-9969-41628801de24" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019fd742-1996-7f3d-a86e-e1c7a65aa41b" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_EntityAddressPostalZipCode_019fd742-1996-7f3d-a86e-e1c7a65aa41b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019fd742-1996-745e-9ba8-f08f0a8279eb" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_CityAreaCode_019fd742-1996-745e-9ba8-f08f0a8279eb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019fd742-1996-7462-8ae7-11f5ca9e300a" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_LocalPhoneNumber_019fd742-1996-7462-8ae7-11f5ca9e300a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019fd742-1996-7c66-8198-0c1573f645e8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_WrittenCommunications_019fd742-1996-7c66-8198-0c1573f645e8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019fd742-1996-74e5-aa34-b707d8137741" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_SolicitingMaterial_019fd742-1996-74e5-aa34-b707d8137741" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019fd742-1996-76aa-a104-7c870d67ed9d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_PreCommencementTenderOffer_019fd742-1996-76aa-a104-7c870d67ed9d" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019fd742-1996-7352-879f-807a7f8cac54" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019fd742-1996-7352-879f-807a7f8cac54" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019fd742-1996-7eca-92cc-5d88a31ff885" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_Security12bTitle_019fd742-1996-7eca-92cc-5d88a31ff885" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019fd742-1996-71e0-835e-c23862e38c05" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_TradingSymbol_019fd742-1996-71e0-835e-c23862e38c05" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019fd742-1996-7160-b626-5fe698cbb170" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_EntityEmergingGrowthCompany_019fd742-1996-7160-b626-5fe698cbb170" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019fd742-1996-79e7-96ca-28ed2d583fc3" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_EntityCentralIndexKey_019fd742-1996-79e7-96ca-28ed2d583fc3" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019fd742-1996-7013-88cd-bab0bffb010d" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_AmendmentFlag_019fd742-1996-7013-88cd-bab0bffb010d" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019fd742-1996-724d-aa64-a4eb7fcde97a" 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_019fd742-1996-7a4c-b1c0-b2e529c93ed6" xlink:to="loc_dei_SecurityExchangeName_019fd742-1996-724d-aa64-a4eb7fcde97a" xlink:type="arc" order="21"/>
  </link:definitionLink>
</link:linkbase>
