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>0001691591</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>MARSON DEBORAH</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>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>2000</noOfUnitsSold>
        <aggregateMarketValue>134860.00</aggregateMarketValue>
        <noOfUnitsOutstanding>291989568</noOfUnitsOutstanding>
        <approxSaleDate>02/01/2024</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/24/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>582</amountOfSecuritiesAcquired>
        <paymentDate>02/24/2022</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/20/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1329</amountOfSecuritiesAcquired>
        <paymentDate>02/20/2022</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/19/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>89</amountOfSecuritiesAcquired>
        <paymentDate>02/19/2022</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Deborah Marson</name>
          <address>
            <com:street1>85 New Hampshire Avenue</com:street1>
            <com:street2>Suite 150</com:street2>
            <com:city>Portsmouth</com:city>
            <com:stateOrCountry>NH</com:stateOrCountry>
            <com:zipCode>03801</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>11/03/2023</saleDate>
        <amountOfSecuritiesSold>2000</amountOfSecuritiesSold>
        <grossProceeds>120620.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Deborah Marson</name>
          <address>
            <com:street1>85 New Hampshire Avenue</com:street1>
            <com:street2>Suite 150</com:street2>
            <com:city>Portsmouth</com:city>
            <com:stateOrCountry>NH</com:stateOrCountry>
            <com:zipCode>03801</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>12/05/2023</saleDate>
        <amountOfSecuritiesSold>2000</amountOfSecuritiesSold>
        <grossProceeds>131880.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Deborah Marson</name>
          <address>
            <com:street1>85 New Hampshire Avenue</com:street1>
            <com:street2>Suite 150</com:street2>
            <com:city>Portsmouth</com:city>
            <com:stateOrCountry>NH</com:stateOrCountry>
            <com:zipCode>03801</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>01/05/2024</saleDate>
        <amountOfSecuritiesSold>2000</amountOfSecuritiesSold>
        <grossProceeds>132320.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>02/01/2024</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>03/15/2023</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/ Gerardo Ibarra-Munoz, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Deborah Marson</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 6010}]
text: 144
  0001691591
  XXXXXXXX
  LIVE
  0001020569
  IRON MOUNTAIN INC
  001-13045
  85 NEW HAMPSHIRE AVENUE, SUITE 150
  PEASE INTERNATIONAL TRADEPORT
  PORTSMOUTH
  NH
  03801
  617-535-4781
  MARSON DEBORAH
  Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  2000
  134860.00
  291989568
  02/01/2024
  NYSE
  Common
  02/24/2022
  Restricted Stock Vesting
  Issuer
  N
  582
  02/24/2022
  Compensation
  Common
  02/20/2022
  Restricted Stock Vesting
  Issuer
  N
  1329
  02/20/2022
  Compensation
  Common
  02/19/2022
  Restricted Stock Vesting
  Issuer
  N
  89
  02/19/2022
  Compensation
  N
  Deborah Marson
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  11/03/2023
  2000
  120620.00
  Deborah Marson
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  12/05/2023
  2000
  131880.00
  Deborah Marson
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  01/05/2024
  2000
  132320.00
  02/01/2024
  03/15/2023
  /s/ Gerardo Ibarra-Munoz, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Deborah Marson