<?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>0001237858</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001441816</issuerCik>
      <issuerName>MongoDB, Inc.</issuerName>
      <secFileNumber>001-38240</secFileNumber>
      <issuerAddress>
        <com:street1>1633 BROADWAY</com:street1>
        <com:street2>38TH FLOOR</com:street2>
        <com:city>NEW YORK</com:city>
        <com:stateOrCountry>NY</com:stateOrCountry>
        <com:zipCode>10019</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>866-237-8815</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>MERRIMAN DWIGHT A</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Wells Fargo Clearing Services</name>
        <address>
          <com:street1>One North Jefferson Avenue</com:street1>
          <com:city>St. Louis</com:city>
          <com:stateOrCountry>MO</com:stateOrCountry>
          <com:zipCode>63103</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>598</noOfUnitsSold>
      <aggregateMarketValue>135197.62</aggregateMarketValue>
      <noOfUnitsOutstanding>73350695</noOfUnitsOutstanding>
      <approxSaleDate>06/25/2024</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>06/25/2024</acquiredDate>
      <natureOfAcquisitionTransaction>RSU's</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>598</amountOfSecuritiesAcquired>
      <paymentDate>06/25/2024</paymentDate>
      <natureOfPayment>N/A</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>DAM 2012 Trust LLC</name>
        <address>
          <com:street1>1633 Broadway 38th Floor</com:street1>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10019</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>04/01/2024</saleDate>
      <amountOfSecuritiesSold>1000</amountOfSecuritiesSold>
      <grossProceeds>362875.08</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Dwight Merriman</name>
        <address>
          <com:street1>1633 Broadway 38th Floor</com:street1>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10019</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>04/03/2024</saleDate>
      <amountOfSecuritiesSold>4000</amountOfSecuritiesSold>
      <grossProceeds>1363978.52</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Dwight Merriman</name>
        <address>
          <com:street1>1633 Broadway 38th, Floor</com:street1>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10019</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>04/08/2024</saleDate>
      <amountOfSecuritiesSold>2000</amountOfSecuritiesSold>
      <grossProceeds>729862.16</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>DAM 2012 Trust LLC</name>
        <address>
          <com:street1>1633 Broadway 38th Floor</com:street1>
          <com:city>Newy York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10019</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>05/01/2024</saleDate>
      <amountOfSecuritiesSold>1000</amountOfSecuritiesSold>
      <grossProceeds>379014.97</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Dwight Merriman</name>
        <address>
          <com:street1>1633 Broadway 38th Floor</com:street1>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10019</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>05/03/2024</saleDate>
      <amountOfSecuritiesSold>6000</amountOfSecuritiesSold>
      <grossProceeds>2249051.09</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Dwight Merriman</name>
        <address>
          <com:street1>1633 Broadway 38th Floor</com:street1>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10019</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <saleDate>06/04/2024</saleDate>
      <amountOfSecuritiesSold>2000</amountOfSecuritiesSold>
      <grossProceeds>468203.98</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>06/25/2024</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>04/06/2023</planAdoptionDate>
      </planAdoptionDates>
      <signature>Dwight A Merriman</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
