<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001783984</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001561550</issuerCik>
            <issuerName>Datadog, Inc.</issuerName>
            <secFileNumber>001-39051</secFileNumber>
            <issuerAddress>
                <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                <ns2:city>NEW YORK </ns2:city>
                <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                <ns2:zipCode>10018</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>8663294466</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>ALEXIS T LEQUOC</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Director</relationshipToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Class A Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>127105</noOfUnitsSold>
            <aggregateMarketValue>16499500.05</aggregateMarketValue>
            <noOfUnitsOutstanding>311110360</noOfUnitsOutstanding>
            <approxSaleDate>10/14/2024</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>10/14/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of Stock Options</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>127105</amountOfSecuritiesAcquired>
            <paymentDate>10/14/2024</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for ALEXIS T LEQUOC</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Class A Common</securitiesClassTitle>
            <saleDate>09/03/2024</saleDate>
            <amountOfSecuritiesSold>127105</amountOfSecuritiesSold>
            <grossProceeds>14304540.79</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>ALEXIS T LEQUOC</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>09/03/2024</saleDate>
            <amountOfSecuritiesSold>11519</amountOfSecuritiesSold>
            <grossProceeds>1307368.49</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales for ALEXIS T LEQUOC</name>
                <address>
                    <ns2:street1>620 EIGHTH AVENUE, 45TH FLOOR </ns2:street1>
                    <ns2:city>NEW YORK </ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10018</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Class A Common</securitiesClassTitle>
            <saleDate>08/12/2024</saleDate>
            <amountOfSecuritiesSold>127105</amountOfSecuritiesSold>
            <grossProceeds>14192579.87</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>Securities to be sold were registered on Form S-8. Sales that were executed on October 14, 2024 are being reported on this Form 144 filed on October 15, 2024 given the EDGAR system was not accepting filings on October 14, 2024 in observance of the federal holiday.  </remarks>
        <noticeSignature>
            <noticeDate>10/14/2024</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>09/05/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Alexis Le-Quoc</signature>
        </noticeSignature>
    </formData>
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144
0001783984
XXXXXXXX
LIVE
0001561550
Datadog, Inc.
001-39051
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
8663294466
ALEXIS T LEQUOC
Director
Officer
Class A Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
127105
16499500.05
311110360
10/14/2024
NASDAQ
Common
10/14/2024
Exercise of Stock Options
Issuer
N
127105
10/14/2024
Cash
N
10b5-1 Sales for ALEXIS T LEQUOC
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Class A Common
09/03/2024
127105
14304540.79
ALEXIS T LEQUOC
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
09/03/2024
11519
1307368.49
10b5-1 Sales for ALEXIS T LEQUOC
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Class A Common
08/12/2024
127105
14192579.87
Securities to be sold were registered on Form S-8. Sales that were executed on October 14, 2024 are being reported on this Form 144 filed on October 15, 2024 given the EDGAR system was not accepting filings on October 14, 2024 in observance of the federal holiday.
10/14/2024
09/05/2023
/s/ Alexis Le-Quoc