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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fcd33-6015-7779-9077-4ffa5f48b861,g:9528a7fd-05ba-4b17-8084-4068b56f9c04-->
<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.lkqcorp.com/role/Form8KEarningsReleaseDocument" xlink:type="simple" xlink:href="lkq-20261029.xsd#Form8KEarningsReleaseDocument"/>
  <link:definitionLink xlink:role="http://www.lkqcorp.com/role/Form8KEarningsReleaseDocument" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsLineItems_019fcd33-6015-7eae-934f-67fb78e2d816" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityListingsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsTable_019fcd33-6015-7dbb-90f5-42a0d4e48e6f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityListingsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityListingsLineItems_019fcd33-6015-7eae-934f-67fb78e2d816" xlink:to="loc_dei_EntityListingsTable_019fcd33-6015-7dbb-90f5-42a0d4e48e6f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019fcd33-6015-72c0-8d85-5d647c15ce3d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntityListingsTable_019fcd33-6015-7dbb-90f5-42a0d4e48e6f" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019fcd33-6015-72c0-8d85-5d647c15ce3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019fcd33-6015-72c0-8d85-5d647c15ce3d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019fcd33-6015-72c0-8d85-5d647c15ce3d" xlink:to="loc_us-gaap_ClassOfStockDomain_019fcd33-6015-72c0-8d85-5d647c15ce3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019fcd33-6015-731b-aef7-4560fcffffbe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019fcd33-6015-72c0-8d85-5d647c15ce3d" xlink:to="loc_us-gaap_ClassOfStockDomain_019fcd33-6015-731b-aef7-4560fcffffbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_CommonStockParValue.01PerShareMember_019fcd33-6015-7518-9bf0-f2017e66907e" xlink:href="lkq-20261029.xsd#lkq_CommonStockParValue.01PerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019fcd33-6015-731b-aef7-4560fcffffbe" xlink:to="loc_lkq_CommonStockParValue.01PerShareMember_019fcd33-6015-7518-9bf0-f2017e66907e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_lkq_EuroNotes2031Member_019fcd33-6015-766a-9dc4-b21343b1e3e8" xlink:href="lkq-20261029.xsd#lkq_EuroNotes2031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019fcd33-6015-731b-aef7-4560fcffffbe" xlink:to="loc_lkq_EuroNotes2031Member_019fcd33-6015-766a-9dc4-b21343b1e3e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019fcd33-6015-78a3-aa50-b90e67e352a0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_019fcd33-6015-7eae-934f-67fb78e2d816" xlink:to="loc_dei_Security12bTitle_019fcd33-6015-78a3-aa50-b90e67e352a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019fcd33-6015-76f2-8d63-1bdb11f23b85" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_019fcd33-6015-7eae-934f-67fb78e2d816" xlink:to="loc_dei_TradingSymbol_019fcd33-6015-76f2-8d63-1bdb11f23b85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019fcd33-6015-7435-9c23-6c696aacedd0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityListingsLineItems_019fcd33-6015-7eae-934f-67fb78e2d816" xlink:to="loc_dei_SecurityExchangeName_019fcd33-6015-7435-9c23-6c696aacedd0" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
