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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e2860-f578-7f06-b8ed-754d9b1d8aa5,g:d8421c48-9ce9-4b3a-ba3d-bd15f78e55cc-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:amt="http://www.americantower.com/20260630" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.americantower.com/20260630">
  <xs:import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2026" schemaLocation="https://xbrl.sec.gov/country/2026/country-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-2026.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="amt-20260630_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="amt-20260630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="amt-20260630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="amt-20260630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="COVER" roleURI="http://www.americantower.com/role/COVER">
        <link:definition>0000001 - Document - COVER</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDBALANCESHEETS" roleURI="http://www.americantower.com/role/CONSOLIDATEDBALANCESHEETS">
        <link:definition>9952151 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDBALANCESHEETSParenthetical" roleURI="http://www.americantower.com/role/CONSOLIDATEDBALANCESHEETSParenthetical">
        <link:definition>9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFOPERATIONS" roleURI="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS">
        <link:definition>9952153 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFOPERATIONSParenthetical" roleURI="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONSParenthetical">
        <link:definition>9952154 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" roleURI="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME">
        <link:definition>9952155 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEParenthetical" roleURI="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEParenthetical">
        <link:definition>9952156 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS" roleURI="http://www.americantower.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS">
        <link:definition>9952157 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical" roleURI="http://www.americantower.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical">
        <link:definition>9952158 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFEQUITY" roleURI="http://www.americantower.com/role/CONSOLIDATEDSTATEMENTSOFEQUITY">
        <link:definition>9952159 - Statement - CONSOLIDATED STATEMENTS OF EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIES" roleURI="http://www.americantower.com/role/BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIES">
        <link:definition>9952160 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PREPAIDANDOTHERCURRENTASSETS" roleURI="http://www.americantower.com/role/PREPAIDANDOTHERCURRENTASSETS">
        <link:definition>9952161 - Disclosure - PREPAID AND OTHER CURRENT ASSETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASES" roleURI="http://www.americantower.com/role/LEASES">
        <link:definition>9952162 - Disclosure - LEASES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETS" roleURI="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETS">
        <link:definition>9952163 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCRUEDEXPENSES" roleURI="http://www.americantower.com/role/ACCRUEDEXPENSES">
        <link:definition>9952164 - Disclosure - ACCRUED EXPENSES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LONGTERMOBLIGATIONS" roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONS">
        <link:definition>9952165 - Disclosure - LONG-TERM OBLIGATIONS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTS" roleURI="http://www.americantower.com/role/FAIRVALUEMEASUREMENTS">
        <link:definition>9952166 - Disclosure - FAIR VALUE MEASUREMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXES" roleURI="http://www.americantower.com/role/INCOMETAXES">
        <link:definition>9952167 - Disclosure - INCOME TAXES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATION" roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATION">
        <link:definition>9952168 - Disclosure - STOCK-BASED COMPENSATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EQUITY" roleURI="http://www.americantower.com/role/EQUITY">
        <link:definition>9952169 - Disclosure - EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NONCONTROLLINGINTERESTS" roleURI="http://www.americantower.com/role/NONCONTROLLINGINTERESTS">
        <link:definition>9952170 - Disclosure - NONCONTROLLING INTERESTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERCOMMONSHARE" roleURI="http://www.americantower.com/role/EARNINGSPERCOMMONSHARE">
        <link:definition>9952171 - Disclosure - EARNINGS PER COMMON SHARE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMMITMENTSANDCONTINGENCIES" roleURI="http://www.americantower.com/role/COMMITMENTSANDCONTINGENCIES">
        <link:definition>9952172 - Disclosure - COMMITMENTS AND CONTINGENCIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BUSINESSSEGMENTS" roleURI="http://www.americantower.com/role/BUSINESSSEGMENTS">
        <link:definition>9952173 - Disclosure - BUSINESS SEGMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESPolicies" roleURI="http://www.americantower.com/role/BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESPolicies">
        <link:definition>9955511 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESTables" roleURI="http://www.americantower.com/role/BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESTables">
        <link:definition>9955512 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PREPAIDANDOTHERCURRENTASSETSTables" roleURI="http://www.americantower.com/role/PREPAIDANDOTHERCURRENTASSETSTables">
        <link:definition>9955513 - Disclosure - PREPAID AND OTHER CURRENT ASSETS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESTables" roleURI="http://www.americantower.com/role/LEASESTables">
        <link:definition>9955514 - Disclosure - LEASES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSTables" roleURI="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSTables">
        <link:definition>9955515 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCRUEDEXPENSESTables" roleURI="http://www.americantower.com/role/ACCRUEDEXPENSESTables">
        <link:definition>9955516 - Disclosure - ACCRUED EXPENSES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LONGTERMOBLIGATIONSTables" roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSTables">
        <link:definition>9955517 - Disclosure - LONG-TERM OBLIGATIONS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTSTables" roleURI="http://www.americantower.com/role/FAIRVALUEMEASUREMENTSTables">
        <link:definition>9955518 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESTables" roleURI="http://www.americantower.com/role/INCOMETAXESTables">
        <link:definition>9955519 - Disclosure - INCOME TAXES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONTables" roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONTables">
        <link:definition>9955520 - Disclosure - STOCK-BASED COMPENSATION (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EQUITYTables" roleURI="http://www.americantower.com/role/EQUITYTables">
        <link:definition>9955521 - Disclosure - EQUITY (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NONCONTROLLINGINTERESTSTables" roleURI="http://www.americantower.com/role/NONCONTROLLINGINTERESTSTables">
        <link:definition>9955522 - Disclosure - NONCONTROLLING INTERESTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERCOMMONSHARETables" roleURI="http://www.americantower.com/role/EARNINGSPERCOMMONSHARETables">
        <link:definition>9955523 - Disclosure - EARNINGS PER COMMON SHARE (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BUSINESSSEGMENTSTables" roleURI="http://www.americantower.com/role/BUSINESSSEGMENTSTables">
        <link:definition>9955524 - Disclosure - BUSINESS SEGMENTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails" roleURI="http://www.americantower.com/role/BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESNarrativeDetails">
        <link:definition>9955525 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESCashandCashEquivalentsandRestrictedCashDetails" roleURI="http://www.americantower.com/role/BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESCashandCashEquivalentsandRestrictedCashDetails">
        <link:definition>9955526 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents and Restricted Cash (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESDisaggregationofRevenueDetails" roleURI="http://www.americantower.com/role/BASISOFPRESENTATIONANDSIGNIFICANTACCOUNTINGPOLICIESDisaggregationofRevenueDetails">
        <link:definition>9955527 - Disclosure - BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of Revenue (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PREPAIDANDOTHERCURRENTASSETSDetails" roleURI="http://www.americantower.com/role/PREPAIDANDOTHERCURRENTASSETSDetails">
        <link:definition>9955528 - Disclosure - PREPAID AND OTHER CURRENT ASSETS (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESScheduleofFutureMinimumRentalReceiptsExpectedUnderOperatingLeasesDetails" roleURI="http://www.americantower.com/role/LEASESScheduleofFutureMinimumRentalReceiptsExpectedUnderOperatingLeasesDetails">
        <link:definition>9955529 - Disclosure - LEASES - Schedule of Future Minimum Rental Receipts Expected Under Operating Leases (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESNarrativeDetails" roleURI="http://www.americantower.com/role/LEASESNarrativeDetails">
        <link:definition>9955530 - Disclosure - LEASES - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESNarrativeDetails_1" roleURI="http://www.americantower.com/role/LEASESNarrativeDetails_1">
        <link:definition>9955530 - Disclosure - LEASES - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESScheduleofInformationAboutOtherLeaserelatedBalancesDetails" roleURI="http://www.americantower.com/role/LEASESScheduleofInformationAboutOtherLeaserelatedBalancesDetails">
        <link:definition>9955531 - Disclosure - LEASES - Schedule of Information About Other Lease-related Balances (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESScheduleofWeightedAverageLeaseTermsAndDiscountRatesDetails" roleURI="http://www.americantower.com/role/LEASESScheduleofWeightedAverageLeaseTermsAndDiscountRatesDetails">
        <link:definition>9955532 - Disclosure - LEASES - Schedule of Weighted Average Lease Terms And Discount Rates (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESScheduleofLeaseCostsDetails" roleURI="http://www.americantower.com/role/LEASESScheduleofLeaseCostsDetails">
        <link:definition>9955533 - Disclosure - LEASES - Schedule of Lease Costs (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESScheduleofSupplementalCashFlowInformationDetails" roleURI="http://www.americantower.com/role/LEASESScheduleofSupplementalCashFlowInformationDetails">
        <link:definition>9955534 - Disclosure - LEASES - Schedule of Supplemental Cash Flow Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESScheduleofMaturitiesOfOperatingLeasesDetails" roleURI="http://www.americantower.com/role/LEASESScheduleofMaturitiesOfOperatingLeasesDetails">
        <link:definition>9955535 - Disclosure - LEASES - Schedule of Maturities Of Operating Leases (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESScheduleofMaturitiesOfOperatingLeasesDetails_1" roleURI="http://www.americantower.com/role/LEASESScheduleofMaturitiesOfOperatingLeasesDetails_1">
        <link:definition>9955535 - Disclosure - LEASES - Schedule of Maturities Of Operating Leases (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSChangesintheCarryingValueofGoodwillDetails" roleURI="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSChangesintheCarryingValueofGoodwillDetails">
        <link:definition>9955536 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in the Carrying Value of Goodwill (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSOtherIntangibleAssetsSubjecttoAmortizationDetails" roleURI="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSOtherIntangibleAssetsSubjecttoAmortizationDetails">
        <link:definition>9955537 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets Subject to Amortization (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails" roleURI="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails">
        <link:definition>9955538 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDOTHERINTANGIBLEASSETSExpectedFutureAmortizationExpensesDetails" roleURI="http://www.americantower.com/role/GOODWILLANDOTHERINTANGIBLEASSETSExpectedFutureAmortizationExpensesDetails">
        <link:definition>9955539 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Expected Future Amortization Expenses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ACCRUEDEXPENSESDetails" roleURI="http://www.americantower.com/role/ACCRUEDEXPENSESDetails">
        <link:definition>9955540 - Disclosure - ACCRUED EXPENSES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LONGTERMOBLIGATIONSLongTermDebtObligationsDetails" roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSLongTermDebtObligationsDetails">
        <link:definition>9955541 - Disclosure - LONG-TERM OBLIGATIONS - Long-Term Debt Obligations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LONGTERMOBLIGATIONSLongTermDebtObligationsDetails_1" roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSLongTermDebtObligationsDetails_1">
        <link:definition>9955541 - Disclosure - LONG-TERM OBLIGATIONS - Long-Term Debt Obligations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LONGTERMOBLIGATIONSRepaymentsofSeniorNotesDetails" roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSRepaymentsofSeniorNotesDetails">
        <link:definition>9955542 - Disclosure - LONG-TERM OBLIGATIONS - Repayments of Senior Notes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LONGTERMOBLIGATIONSOfferingsofSeniorNotesDetails" roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSOfferingsofSeniorNotesDetails">
        <link:definition>9955543 - Disclosure - LONG-TERM OBLIGATIONS - Offerings of Senior Notes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LONGTERMOBLIGATIONSKeyTermsofNotesDetails" roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSKeyTermsofNotesDetails">
        <link:definition>9955544 - Disclosure - LONG-TERM OBLIGATIONS - Key Terms of Notes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LONGTERMOBLIGATIONSBankFacilitiesDetails" roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSBankFacilitiesDetails">
        <link:definition>9955545 - Disclosure - LONG-TERM OBLIGATIONS - Bank Facilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LONGTERMOBLIGATIONSCreditFacilitiesandTermLoansDetails" roleURI="http://www.americantower.com/role/LONGTERMOBLIGATIONSCreditFacilitiesandTermLoansDetails">
        <link:definition>9955546 - Disclosure - LONG-TERM OBLIGATIONS - Credit Facilities and Term Loans (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTSAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" roleURI="http://www.americantower.com/role/FAIRVALUEMEASUREMENTSAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails">
        <link:definition>9955547 - Disclosure - FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTSNarrativeDetails" roleURI="http://www.americantower.com/role/FAIRVALUEMEASUREMENTSNarrativeDetails">
        <link:definition>9955548 - Disclosure - FAIR VALUE MEASUREMENTS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTSContractualAmountsofOutstandingInstrumentsDetails" roleURI="http://www.americantower.com/role/FAIRVALUEMEASUREMENTSContractualAmountsofOutstandingInstrumentsDetails">
        <link:definition>9955549 - Disclosure - FAIR VALUE MEASUREMENTS - Contractual Amounts of Outstanding Instruments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESNarrativeDetails" roleURI="http://www.americantower.com/role/INCOMETAXESNarrativeDetails">
        <link:definition>9955550 - Disclosure - INCOME TAXES - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESPenaltiesandIncomeTaxRelatedExpensesDetails" roleURI="http://www.americantower.com/role/INCOMETAXESPenaltiesandIncomeTaxRelatedExpensesDetails">
        <link:definition>9955551 - Disclosure - INCOME TAXES - Penalties and Income Tax Related Expenses (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONNarrativeDetails" roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONNarrativeDetails">
        <link:definition>9955552 - Disclosure - STOCK-BASED COMPENSATION - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONStockBasedCompensationExpenseDetails" roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONStockBasedCompensationExpenseDetails">
        <link:definition>9955553 - Disclosure - STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONSummaryoftheCompanysOptionActivityDetails" roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONSummaryoftheCompanysOptionActivityDetails">
        <link:definition>9955554 - Disclosure - STOCK-BASED COMPENSATION - Summary of the Company's Option Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONKeyAssumptionsDetails" roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONKeyAssumptionsDetails">
        <link:definition>9955555 - Disclosure - STOCK-BASED COMPENSATION - Key Assumptions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONSummaryofRSUsandPSUsDetails" roleURI="http://www.americantower.com/role/STOCKBASEDCOMPENSATIONSummaryofRSUsandPSUsDetails">
        <link:definition>9955556 - Disclosure - STOCK-BASED COMPENSATION - Summary of RSUs and PSUs (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EQUITYNarrativeDetails" roleURI="http://www.americantower.com/role/EQUITYNarrativeDetails">
        <link:definition>9955557 - Disclosure - EQUITY - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EQUITYDistributionsDetails" roleURI="http://www.americantower.com/role/EQUITYDistributionsDetails">
        <link:definition>9955558 - Disclosure - EQUITY - Distributions (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NONCONTROLLINGINTERESTSNarrativeDetails" roleURI="http://www.americantower.com/role/NONCONTROLLINGINTERESTSNarrativeDetails">
        <link:definition>9955559 - Disclosure - NONCONTROLLING INTERESTS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NONCONTROLLINGINTERESTSChangesinNoncontrollingInterestDetails" roleURI="http://www.americantower.com/role/NONCONTROLLINGINTERESTSChangesinNoncontrollingInterestDetails">
        <link:definition>9955560 - Disclosure - NONCONTROLLING INTERESTS - Changes in Noncontrolling Interest (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERCOMMONSHAREBasicandDilutedEarningsPerShareDetails" roleURI="http://www.americantower.com/role/EARNINGSPERCOMMONSHAREBasicandDilutedEarningsPerShareDetails">
        <link:definition>9955561 - Disclosure - EARNINGS PER COMMON SHARE - Basic and Diluted Earnings Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERCOMMONSHARESharesExcludedFromComputationofEarningsPerShareDetails" roleURI="http://www.americantower.com/role/EARNINGSPERCOMMONSHARESharesExcludedFromComputationofEarningsPerShareDetails">
        <link:definition>9955562 - Disclosure - EARNINGS PER COMMON SHARE - Shares Excluded From Computation of Earnings Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMMITMENTSANDCONTINGENCIESDetails" roleURI="http://www.americantower.com/role/COMMITMENTSANDCONTINGENCIESDetails">
        <link:definition>9955563 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BUSINESSSEGMENTSNarrativeDetails" roleURI="http://www.americantower.com/role/BUSINESSSEGMENTSNarrativeDetails">
        <link:definition>9955564 - Disclosure - BUSINESS SEGMENTS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BUSINESSSEGMENTSSummarizedSegmentFinancialInformationDetails" roleURI="http://www.americantower.com/role/BUSINESSSEGMENTSSummarizedSegmentFinancialInformationDetails">
        <link:definition>9955565 - Disclosure - BUSINESS SEGMENTS - Summarized Segment Financial Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="amt_A0450SeniorNotesDue2027Member" abstract="true" name="A0450SeniorNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A0400SeniorNotesDue2027Member" abstract="true" name="A0400SeniorNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A4.125SeniorNotesDue2027Member" abstract="true" name="A4.125SeniorNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A0500SeniorNotesDue2028Member" abstract="true" name="A0500SeniorNotesDue2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A0875SeniorNotesDue2029Member" abstract="true" name="A0875SeniorNotesDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A0950SeniorNotesDue2030Member" abstract="true" name="A0950SeniorNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A3.900SeniorNotesDue2030Member" abstract="true" name="A3.900SeniorNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A4625SeniorNotesDue2031Member" abstract="true" name="A4625SeniorNotesDue2031Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A1000SeniorNotesDue2032Member" abstract="true" name="A1000SeniorNotesDue2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A3.625SeniorNotesDue2032Member" abstract="true" name="A3.625SeniorNotesDue2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A1250SeniorNotesDue2033Member" abstract="true" name="A1250SeniorNotesDue2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A4.000SeniorNotesDue2033Member" abstract="true" name="A4.000SeniorNotesDue2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A4.100SeniorNotesDue2034Member" abstract="true" name="A4.100SeniorNotesDue2034Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_PropertyRevenueMember" abstract="true" name="PropertyRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_DepreciationAmortizationAndAccretionIncludingDiscontinuedOperations" abstract="false" name="DepreciationAmortizationAndAccretionIncludingDiscontinuedOperations" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_IncreaseDecreaseInRightOfUseAssetAndOperatingLeaseLiability" abstract="false" name="IncreaseDecreaseInRightOfUseAssetAndOperatingLeaseLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_ProceedsFromSaleOfAvailableForSaleSecuritiesAndOtherProductiveAssets" abstract="false" name="ProceedsFromSaleOfAvailableForSaleSecuritiesAndOtherProductiveAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_PaymentsOfOrdinaryDividendsCommonStockAndShareBasedPaymentArrangement" abstract="false" name="PaymentsOfOrdinaryDividendsCommonStockAndShareBasedPaymentArrangement" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_CapitalExpendituresIncurredButNotYetPaidIncreaseDecrease" abstract="false" name="CapitalExpendituresIncurredButNotYetPaidIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_LeaseAssetsAndLiabilitiesTableTextBlock" abstract="false" name="LeaseAssetsAndLiabilitiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="amt_ScheduleOfNotionalAmountsOfOutstandingNonderivativePositionsTableTextBlock" abstract="false" name="ScheduleOfNotionalAmountsOfOutstandingNonderivativePositionsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="amt_AccountingPoliciesTable" abstract="true" name="AccountingPoliciesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="amt_ATCEuropeMember" abstract="true" name="ATCEuropeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_StonepeakPartnersLPMember" abstract="true" name="StonepeakPartnersLPMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_SubsidiariesOperatingInGermanyMember" abstract="true" name="SubsidiariesOperatingInGermanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_SubsidiariesOperatingInSpainMember" abstract="true" name="SubsidiariesOperatingInSpainMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_PropertyDataCentersMember" abstract="true" name="PropertyDataCentersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_ATCPhilippinesMember" abstract="true" name="ATCPhilippinesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_KirtonkholaTowerBangladeshLimitedMember" abstract="true" name="KirtonkholaTowerBangladeshLimitedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_GrossProfitOperatingSegmentsMember" abstract="true" name="GrossProfitOperatingSegmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_OperatingIncomeLossOperatingSegmentsMember" abstract="true" name="OperatingIncomeLossOperatingSegmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_CommunicationSitesMember" abstract="true" name="CommunicationSitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_AccountingPoliciesLineItems" abstract="true" name="AccountingPoliciesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="amt_StraightLineRevenue" abstract="false" name="StraightLineRevenue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_NonLeasePropertyRevenueMember" abstract="true" name="NonLeasePropertyRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_ServicesRevenueMember" abstract="true" name="ServicesRevenueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_PropertyUSAndCanadaMember" abstract="true" name="PropertyUSAndCanadaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_PropertyAfricaAPACMember" abstract="true" name="PropertyAfricaAPACMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_PropertyEuropeMember" abstract="true" name="PropertyEuropeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_PropertyLatinAmericaMember" abstract="true" name="PropertyLatinAmericaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_LessorOperatingLeasePaymentToBeReceivedAfterYearFour" abstract="false" name="LessorOperatingLeasePaymentToBeReceivedAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_AmortizationOfLeaseIncentivePeriod" abstract="false" name="AmortizationOfLeaseIncentivePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="amt_OperatingLeasesAbstract" abstract="true" name="OperatingLeasesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="amt_CashFlowLesseeAbstract" abstract="true" name="CashFlowLesseeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="amt_NonCashItemsAbstract" abstract="true" name="NonCashItemsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="amt_NonCashOperatingAndFinancingLeaseModifications" abstract="false" name="NonCashOperatingAndFinancingLeaseModifications" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" abstract="false" name="LesseeOperatingLeaseLiabilityToBePaidAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_ServicesSegmentMember" abstract="true" name="ServicesSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_AcquiredNetworkLocationMember" abstract="true" name="AcquiredNetworkLocationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_AcquiredLicensesAndOtherIntangiblesMember" abstract="true" name="AcquiredLicensesAndOtherIntangiblesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_AccruedPassThroughCosts" abstract="false" name="AccruedPassThroughCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_AcquisitionRelatedPayablesCurrent" abstract="false" name="AcquisitionRelatedPayablesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_AccruedPropertyAndRealEstateTaxes" abstract="false" name="AccruedPropertyAndRealEstateTaxes" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_AccruedExpensesDeferredPaymentOfPostClosingAdjustmentsAmount" abstract="false" name="AccruedExpensesDeferredPaymentOfPostClosingAdjustmentsAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_A2021MulticurrencyCreditFacilityMember" abstract="true" name="A2021MulticurrencyCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2021TermLoanMember" abstract="true" name="A2021TermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2021CreditFacilityMember" abstract="true" name="A2021CreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A4.400SeniorNotesDue2026Member" abstract="true" name="A4.400SeniorNotesDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A1600SeniorNotesDue2026Member" abstract="true" name="A1600SeniorNotesDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A1950SeniorNotesDue2026Member" abstract="true" name="A1950SeniorNotesDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A1450SeniorNotesDue2026Member" abstract="true" name="A1450SeniorNotesDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A3375SeniorNotesDue2026Member" abstract="true" name="A3375SeniorNotesDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A3125SeniorNotesDue2027Member" abstract="true" name="A3125SeniorNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2750SeniorNotesDue2027Member" abstract="true" name="A2750SeniorNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A3650SeniorNotesDue2027Member" abstract="true" name="A3650SeniorNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A355SeniorNotesDue2027Member" abstract="true" name="A355SeniorNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A3600SeniorNotesDue2028Member" abstract="true" name="A3600SeniorNotesDue2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A1500SeniorNotesDue2028Member" abstract="true" name="A1500SeniorNotesDue2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A5500SeniorNotesDue2028Member" abstract="true" name="A5500SeniorNotesDue2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A5250SeniorNotesDue2028Member" abstract="true" name="A5250SeniorNotesDue2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A5800SeniorNotesDue2028Member" abstract="true" name="A5800SeniorNotesDue2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A5.200SeniorNotesDue2029Member" abstract="true" name="A5.200SeniorNotesDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A3950SeniorNotesDue2029Member" abstract="true" name="A3950SeniorNotesDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A3800SeniorNotesDue2029Member" abstract="true" name="A3800SeniorNotesDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2900SeniorNotesDue2030Member" abstract="true" name="A2900SeniorNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A5.000SeniorNotesDue2030Member" abstract="true" name="A5.000SeniorNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A4.900SeniorNotesDue2030Member" abstract="true" name="A4.900SeniorNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2100SeniorNotesDue2030Member" abstract="true" name="A2100SeniorNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A1875SeniorNotesDue2030Member" abstract="true" name="A1875SeniorNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2700SeniorNotesDue2031Member" abstract="true" name="A2700SeniorNotesDue2031Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2300SeniorNotesDue2031Member" abstract="true" name="A2300SeniorNotesDue2031Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A4050SeniorNotesDue2032Member" abstract="true" name="A4050SeniorNotesDue2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A4.700SeniorNotesDue2032Member" abstract="true" name="A4.700SeniorNotesDue2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A5650SeniorNotesDue2033Member" abstract="true" name="A5650SeniorNotesDue2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A5550SeniorNotesDue2033Member" abstract="true" name="A5550SeniorNotesDue2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A5900SeniorNotesDue2033Member" abstract="true" name="A5900SeniorNotesDue2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A5.450SeniorNotesDue2034Member" abstract="true" name="A5.450SeniorNotesDue2034Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A5.400SeniorNotesDue2035Member" abstract="true" name="A5.400SeniorNotesDue2035Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A5.350SeniorNotesDue2035Member" abstract="true" name="A5.350SeniorNotesDue2035Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A3700SeniorNotesDue2049Member" abstract="true" name="A3700SeniorNotesDue2049Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A3100SeniorNotesDue2050Member" abstract="true" name="A3100SeniorNotesDue2050Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2950SeniorNotesDue2051Member" abstract="true" name="A2950SeniorNotesDue2051Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_SecuredTowerRevenueSecuritiesSeries20181AMember" abstract="true" name="SecuredTowerRevenueSecuritiesSeries20181AMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_SecuredTowerRevenueSecuritiesSeries20231AMember" abstract="true" name="SecuredTowerRevenueSecuritiesSeries20231AMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_OtherSubsidiaryDebtMember" abstract="true" name="OtherSubsidiaryDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_DebtInstrumentRepaidPrincipalAmount" abstract="false" name="DebtInstrumentRepaidPrincipalAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DebtInstrumentRepaidIncludingInterest" abstract="false" name="DebtInstrumentRepaidIncludingInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_DebtInstrumentRedemptionOptionAxis" abstract="true" name="DebtInstrumentRedemptionOptionAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="amt_DebtInstrumentRedemptionOptionDomain" abstract="true" name="DebtInstrumentRedemptionOptionDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_DebtInstrumentRedemptionOptionTwoMember" abstract="true" name="DebtInstrumentRedemptionOptionTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_MaximumAdjustedEBITDA" abstract="false" name="MaximumAdjustedEBITDA" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="amt_DebtInstrumentRedemptionOptionOneMember" abstract="true" name="DebtInstrumentRedemptionOptionOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_AcquisitionRelatedLoansMember" abstract="true" name="AcquisitionRelatedLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_NumberOfAnnualRenewalPeriods" abstract="false" name="NumberOfAnnualRenewalPeriods" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="amt_StockOptionsAndTimeBasedRestrictedStockUnitsMember" abstract="true" name="StockOptionsAndTimeBasedRestrictedStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2007PlanMember" abstract="true" name="A2007PlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2026PlanMember" abstract="true" name="A2026PlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2026PSUsMember" abstract="true" name="A2026PSUsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2025PSUsMember" abstract="true" name="A2025PSUsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2024PSUsMember" abstract="true" name="A2024PSUsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_PercentageOfPotentialTargetShares" abstract="false" name="PercentageOfPotentialTargetShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="amt_ExecutiveVicePresidentAndPresidentAPACMember" abstract="true" name="ExecutiveVicePresidentAndPresidentAPACMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_A2023PSUsMember" abstract="true" name="A2023PSUsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestedAndDeferred" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentOtherThanOptionsVestedAndDeferred" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="amt_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="amt_A2017BuybackMember" abstract="true" name="A2017BuybackMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_AccruedDividendRSU" abstract="false" name="AccruedDividendRSU" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_PaidDividendRSU" abstract="false" name="PaidDividendRSU" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_SubsidiariesOperatingInFranceMember" abstract="true" name="SubsidiariesOperatingInFranceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_CaisseDeDepotEtPlacementDuQuebecMember" abstract="true" name="CaisseDeDepotEtPlacementDuQuebecMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_AllianzCapitalPartnersMember" abstract="true" name="AllianzCapitalPartnersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_ConfidenceGroupMember" abstract="true" name="ConfidenceGroupMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_ATCEuropeC.V.Member" abstract="true" name="ATCEuropeC.V.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_ATIberiaCvMember" abstract="true" name="ATIberiaCvMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_VerizonTransactionMember" abstract="true" name="VerizonTransactionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_ATAndTTransactionMember" abstract="true" name="ATAndTTransactionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_LeasedAssetsNumberOfSites" abstract="false" name="LeasedAssetsNumberOfSites" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="amt_RightToLeaseWeightedAverageTerm" abstract="false" name="RightToLeaseWeightedAverageTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="amt_AggregatePurchaseOptionPriceForTowers" abstract="false" name="AggregatePurchaseOptionPriceForTowers" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="amt_CustomerLeaseInitialTerm" abstract="false" name="CustomerLeaseInitialTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="amt_SuccessiveTermsToRenewLease" abstract="false" name="SuccessiveTermsToRenewLease" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="amt_LeasedAssetsPurchasedNumberOfSites" abstract="false" name="LeasedAssetsPurchasedNumberOfSites" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="amt_NumberOfSitesAcquired" abstract="false" name="NumberOfSitesAcquired" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="amt_NumberOfDataCentersOperated" abstract="false" name="NumberOfDataCentersOperated" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="amt_NumberOfOperatingMarkets" abstract="false" name="NumberOfOperatingMarkets" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="amt_NumberOfReportableSegmentsDisclosedByDefinitionFlag" abstract="false" name="NumberOfReportableSegmentsDisclosedByDefinitionFlag" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="amt_PropertyMember" abstract="true" name="PropertyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_ATCPhilippinesAndKirtonkholaTowerBangladeshLimitedMember" abstract="true" name="ATCPhilippinesAndKirtonkholaTowerBangladeshLimitedMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="amt_SouthAfricaFiberMember" abstract="true" name="SouthAfricaFiberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
