content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
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      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001595956</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001020569</issuerCik>
        <issuerName>IRON MOUNTAIN INC</issuerName>
        <secFileNumber>001-13045</secFileNumber>
        <issuerAddress>
          <com:street1>85 NEW HAMPSHIRE AVENUE, SUITE 150</com:street1>
          <com:street2>PEASE INTERNATIONAL TRADEPORT</com:street2>
          <com:city>PORTSMOUTH</com:city>
          <com:stateOrCountry>NH</com:stateOrCountry>
          <com:zipCode>03801</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>617-535-4781</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Tomovcsik John</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Former Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Fidelity Brokerage Services LLC</name>
          <address>
            <com:street1>900 Salem Street</com:street1>
            <com:city>Smithfield</com:city>
            <com:stateOrCountry>RI</com:stateOrCountry>
            <com:zipCode>02917</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>35084</noOfUnitsSold>
        <aggregateMarketValue>3114042.02</aggregateMarketValue>
        <noOfUnitsOutstanding>293133321</noOfUnitsOutstanding>
        <approxSaleDate>06/20/2024</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/09/2013</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>4692</amountOfSecuritiesAcquired>
        <paymentDate>09/09/2013</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>11/29/2013</acquiredDate>
        <natureOfAcquisitionTransaction>ESPP Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>175</amountOfSecuritiesAcquired>
        <paymentDate>11/29/2013</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>12/13/2013</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1802</amountOfSecuritiesAcquired>
        <paymentDate>12/13/2013</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/09/2014</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>814</amountOfSecuritiesAcquired>
        <paymentDate>03/09/2014</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/11/2014</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2797</amountOfSecuritiesAcquired>
        <paymentDate>03/11/2014</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/15/2014</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>639</amountOfSecuritiesAcquired>
        <paymentDate>03/15/2014</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/30/2014</acquiredDate>
        <natureOfAcquisitionTransaction>ESPP Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>688</amountOfSecuritiesAcquired>
        <paymentDate>05/30/2014</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/08/2015</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2538</amountOfSecuritiesAcquired>
        <paymentDate>09/08/2015</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>12/13/2015</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1922</amountOfSecuritiesAcquired>
        <paymentDate>12/13/2015</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/13/2016</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1524</amountOfSecuritiesAcquired>
        <paymentDate>02/13/2016</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/19/2016</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1268</amountOfSecuritiesAcquired>
        <paymentDate>02/19/2016</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/15/2016</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>421</amountOfSecuritiesAcquired>
        <paymentDate>03/15/2016</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/31/2019</acquiredDate>
        <natureOfAcquisitionTransaction>ESPP Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>148</amountOfSecuritiesAcquired>
        <paymentDate>05/31/2019</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>11/29/2019</acquiredDate>
        <natureOfAcquisitionTransaction>ESPP Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>233</amountOfSecuritiesAcquired>
        <paymentDate>11/29/2019</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/29/2020</acquiredDate>
        <natureOfAcquisitionTransaction>ESPP Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>701</amountOfSecuritiesAcquired>
        <paymentDate>05/29/2020</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>11/30/2020</acquiredDate>
        <natureOfAcquisitionTransaction>ESPP Purchase</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>93</amountOfSecuritiesAcquired>
        <paymentDate>11/30/2020</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/01/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>14629</amountOfSecuritiesAcquired>
        <paymentDate>03/01/2024</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>06/20/2024</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>03/06/2024</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/ Emily Navaro, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for John Tomovcsik.</signature>
      </noticeSignature>
    </formData>
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metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 11513}]
text: 144
  0001595956
  XXXXXXXX
  LIVE
  0001020569
  IRON MOUNTAIN INC
  001-13045
  85 NEW HAMPSHIRE AVENUE, SUITE 150
  PEASE INTERNATIONAL TRADEPORT
  PORTSMOUTH
  NH
  03801
  617-535-4781
  Tomovcsik John
  Former Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  35084
  3114042.02
  293133321
  06/20/2024
  NYSE
  Common
  09/09/2013
  Restricted Stock Vesting
  Issuer
  N
  4692
  09/09/2013
  Compensation
  Common
  11/29/2013
  ESPP Purchase
  Issuer
  N
  175
  11/29/2013
  Cash
  Common
  12/13/2013
  Restricted Stock Vesting
  Issuer
  N
  1802
  12/13/2013
  Compensation
  Common
  03/09/2014
  Restricted Stock Vesting
  Issuer
  N
  814
  03/09/2014
  Compensation
  Common
  03/11/2014
  Restricted Stock Vesting
  Issuer
  N
  2797
  03/11/2014
  Compensation
  Common
  03/15/2014
  Restricted Stock Vesting
  Issuer
  N
  639
  03/15/2014
  Compensation
  Common
  05/30/2014
  ESPP Purchase
  Issuer
  N
  688
  05/30/2014
  Cash
  Common
  09/08/2015
  Restricted Stock Vesting
  Issuer
  N
  2538
  09/08/2015
  Compensation
  Common
  12/13/2015
  Restricted Stock Vesting
  Issuer
  N
  1922
  12/13/2015
  Compensation
  Common
  02/13/2016
  Restricted Stock Vesting
  Issuer
  N
  1524
  02/13/2016
  Compensation
  Common
  02/19/2016
  Restricted Stock Vesting
  Issuer
  N
  1268
  02/19/2016
  Compensation
  Common
  03/15/2016
  Restricted Stock Vesting
  Issuer
  N
  421
  03/15/2016
  Compensation
  Common
  05/31/2019
  ESPP Purchase
  Issuer
  N
  148
  05/31/2019
  Cash
  Common
  11/29/2019
  ESPP Purchase
  Issuer
  N
  233
  11/29/2019
  Cash
  Common
  05/29/2020
  ESPP Purchase
  Issuer
  N
  701
  05/29/2020
  Cash
  Common
  11/30/2020
  ESPP Purchase
  Issuer
  N
  93
  11/30/2020
  Cash
  Common
  03/01/2024
  Restricted Stock Vesting
  Issuer
  N
  14629
  03/01/2024
  Compensation
  Y
  06/20/2024
  03/06/2024
  /s/ Emily Navaro, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for John Tomovcsik.