content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
    <headerData>
      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001723099</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000868857</issuerCik>
        <issuerName>AECOM</issuerName>
        <secFileNumber>000-52423</secFileNumber>
        <issuerAddress>
          <com:street1>13355 NOEL ROAD</com:street1>
          <com:street2>SUITE 400</com:street2>
          <com:city>DALLAS</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>75240</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>(972) 788-1000</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Poloni Lara</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Merrill Lynch</name>
          <address>
            <com:street1>3455 Peachtree Road NE</com:street1>
            <com:street2>Suite 1000</com:street2>
            <com:city>Atlanta</com:city>
            <com:stateOrCountry>GA</com:stateOrCountry>
            <com:zipCode>30326</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>30692</noOfUnitsSold>
        <aggregateMarketValue>2839013.99</aggregateMarketValue>
        <noOfUnitsOutstanding>135987254</noOfUnitsOutstanding>
        <approxSaleDate>12/14/2023</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>12/16/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting of a Stock Award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>AECOM</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>19599</amountOfSecuritiesAcquired>
        <paymentDate>12/16/2022</paymentDate>
        <natureOfPayment>Compensatory Payment</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/15/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting of a Stock Award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>AECOM</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>11093</amountOfSecuritiesAcquired>
        <paymentDate>08/15/2023</paymentDate>
        <natureOfPayment>Compensatory Payment</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>12/14/2023</noticeDate>
        <signature>Lara Poloni</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 3325}]
text: 144
  0001723099
  XXXXXXXX
  LIVE
  0000868857
  AECOM
  000-52423
  13355 NOEL ROAD
  SUITE 400
  DALLAS
  TX
  75240
  (972) 788-1000
  Poloni Lara
  Officer
  Common
  Merrill Lynch
  3455 Peachtree Road NE
  Suite 1000
  Atlanta
  GA
  30326
  30692
  2839013.99
  135987254
  12/14/2023
  NYSE
  Common
  12/16/2022
  Vesting of a Stock Award
  AECOM
  N
  19599
  12/16/2022
  Compensatory Payment
  Common
  08/15/2023
  Vesting of a Stock Award
  AECOM
  N
  11093
  08/15/2023
  Compensatory Payment
  Y
  12/14/2023
  Lara Poloni