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>0001831911</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000771497</issuerCik>
        <issuerName>ABM INDUSTRIES INC /DE/</issuerName>
        <secFileNumber>001-08929</secFileNumber>
        <issuerAddress>
          <com:street1>ONE LIBERTY PLAZA</com:street1>
          <com:street2>7TH FLOOR</com:street2>
          <com:city>NEW YORK</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10006</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>212 297-0200</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>MAHONEY SEAN MICHAEL</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Merrill Lynch</name>
          <address>
            <com:street1>225 Liberty St</com:street1>
            <com:street2>Floor 37</com:street2>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10281</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>1800</noOfUnitsSold>
        <aggregateMarketValue>90061.00</aggregateMarketValue>
        <noOfUnitsOutstanding>62231437</noOfUnitsOutstanding>
        <approxSaleDate>05/07/2025</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>01/10/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting of restricted stock unit award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>ABM INDUSTRIES INC /DE/</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>47</amountOfSecuritiesAcquired>
        <paymentDate>01/10/2020</paymentDate>
        <natureOfPayment>Granted as part of issuer equity compensation plan</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>09/11/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting of performance share award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>ABM INDUSTRIES INC /DE/</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>308</amountOfSecuritiesAcquired>
        <paymentDate>09/11/2020</paymentDate>
        <natureOfPayment>Granted as part of issuer equity compensation plan</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>01/11/2021</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting of performance share award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>ABM INDUSTRIES INC /DE/</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1445</amountOfSecuritiesAcquired>
        <paymentDate>01/11/2021</paymentDate>
        <natureOfPayment>Vesting of restricted stock unit award</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Sean Mahoney</name>
          <address>
            <com:street1>ONE LIBERTY PLAZA</com:street1>
            <com:street2>7TH FLOOR</com:street2>
            <com:city>NEW YORK</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10006</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <saleDate>05/05/2025</saleDate>
        <amountOfSecuritiesSold>574</amountOfSecuritiesSold>
        <grossProceeds>28735.78</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>05/07/2025</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>01/09/2025</planAdoptionDate>
        </planAdoptionDates>
        <signature>Sean Mahoney</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 4812}]
text: 144
  0001831911
  XXXXXXXX
  LIVE
  0000771497
  ABM INDUSTRIES INC /DE/
  001-08929
  ONE LIBERTY PLAZA
  7TH FLOOR
  NEW YORK
  NY
  10006
  212 297-0200
  MAHONEY SEAN MICHAEL
  Officer
  Common Stock
  Merrill Lynch
  225 Liberty St
  Floor 37
  New York
  NY
  10281
  1800
  90061.00
  62231437
  05/07/2025
  NYSE
  Common Stock
  01/10/2020
  Vesting of restricted stock unit award
  ABM INDUSTRIES INC /DE/
  N
  47
  01/10/2020
  Granted as part of issuer equity compensation plan
  Common Stock
  09/11/2020
  Vesting of performance share award
  ABM INDUSTRIES INC /DE/
  N
  308
  09/11/2020
  Granted as part of issuer equity compensation plan
  Common Stock
  01/11/2021
  Vesting of performance share award
  ABM INDUSTRIES INC /DE/
  N
  1445
  01/11/2021
  Vesting of restricted stock unit award
  N
  Sean Mahoney
  ONE LIBERTY PLAZA
  7TH FLOOR
  NEW YORK
  NY
  10006
  Common Stock
  05/05/2025
  574
  28735.78
  05/07/2025
  01/09/2025
  Sean Mahoney