September 11, 2019

Olivier Pomel
Chief Executive Officer
Datadog, Inc.
620 8th Avenue, 45th Floor
New York, NY 10018

       Re: Datadog, Inc.
           Amendment No.1 to Registration Statement on Form S-1
           Filed September 9, 2019
           File No. 333-233428

Dear Mr. Pomel:

       We have reviewed your amended registration statement and have the
following
comment. Our comment may ask you to provide us with information so we may
better
understand your disclosure.

       Please respond to this letter by amending your registration statement
and providing the
requested information. If you do not believe our comment apply to your facts
and circumstances
or do not believe an amendment is appropriate, please tell us why in your
response.

       After reviewing any amendment to your registration statement and the
information you
provide in response to the comment, we may have additional comments.

Amendment No.1 to Form S-1 Filed on September 9, 2019

Dilution, page 51

1.    Please provide your calculations to support the pro forma net tangible
book value of $60.6
      million. It appears that such calculations include both goodwill and
deferred contract
      costs in your total tangible assets. Please tell us how you determined
that these assets, as
      well as any other intangible items included in your balance sheet, are
tangible assets for
      purposes of your dilution calculations or revise. Similar revisions
should be made to the
      historical net tangible book value per share and the pro forma net
tangible book value per
      share after this offering, as necessary
 Olivier Pomel
FirstName LastNameOlivier Pomel
Datadog, Inc.
Comapany 11, 2019
September NameDatadog, Inc.
Page 2
September 11, 2019 Page 2
FirstName LastName
        You may contact Eiko Yaoita Pyles, Staff Accountant at (202) 551-3587
or Kathleen
Collins, Accounting Branch Chief, at (202) 551-3499 if you have questions
regarding comments
on the financial statements and related matters. Please contact Edwin Kim,
Staff Attorney, at
(202) 551-3297 or Jan Woo, Legal Branch Chief, at (202) 551-3453 with any other
questions.



                                                          Sincerely,

                                                          Division of
Corporation Finance
                                                          Office of Information
Technologies
                                                          and Services
cc:      Nicole Brookshire, Esq.