<?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>0001783990</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001561550</issuerCik>
            <issuerName>DATADOG INC CL A</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>OLIVIER POMEL</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>38th Fl.</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>85637</noOfUnitsSold>
            <aggregateMarketValue>8371016.75</aggregateMarketValue>
            <noOfUnitsOutstanding>296268680</noOfUnitsOutstanding>
            <approxSaleDate>06/14/2023</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>06/14/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of Stock Options</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>85637</amountOfSecuritiesAcquired>
            <paymentDate>06/14/2023</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>OLIVIER POMEL</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>06/02/2023</saleDate>
            <amountOfSecuritiesSold>18652</amountOfSecuritiesSold>
            <grossProceeds>1871392.46</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for OLIVIER POMEL</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>05/08/2023</saleDate>
            <amountOfSecuritiesSold>85637</amountOfSecuritiesSold>
            <grossProceeds>6602527.06</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for OLIVIER POMEL</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>04/10/2023</saleDate>
            <amountOfSecuritiesSold>85637</amountOfSecuritiesSold>
            <grossProceeds>5592275.94</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>Securities to be sold were registered on Form S-8</remarks>
        <noticeSignature>
            <noticeDate>06/14/2023</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>12/12/2022</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/  Olivier Pomel</signature>
        </noticeSignature>
    </formData>
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144
0001783990
XXXXXXXX
LIVE
0001561550
DATADOG INC CL A
001-39051
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
8663294466
OLIVIER POMEL
Officer
COMMON
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
38th Fl.
New York
NY
10004
85637
8371016.75
296268680
06/14/2023
NASDAQ
Common
06/14/2023
Exercise of Stock Options
Issuer
N
85637
06/14/2023
Cash
N
OLIVIER POMEL
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
06/02/2023
18652
1871392.46
10b5-1 Sales Plan for OLIVIER POMEL
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
05/08/2023
85637
6602527.06
10b5-1 Sales Plan for OLIVIER POMEL
620 EIGHTH AVENUE, 45TH FLOOR
NEW YORK
NY
10018
Common
04/10/2023
85637
5592275.94
Securities to be sold were registered on Form S-8
06/14/2023
12/12/2022
/s/  Olivier Pomel