April 5, 2019

Antony Mattessich
Chief Executive Officer
Ocular Therapeutix, Inc.
15 Crosby Drive
Bedford, MA 01730

       Re: Ocular Therapeutix, Inc.
           Registration Statement on Form S-3
           Filed April 1, 2019
           File No. 333-230659

Dear Mr. Mattessich:

       This is to advise you that we have not reviewed and will not review your
registration
statement.

        Please refer to Rules 460 and 461 regarding requests for acceleration.
We remind you
that the company and its management are responsible for the accuracy and
adequacy of their
disclosures, notwithstanding any review, comments, action or absence of action
by the staff.

       Please contact Donald Field at 202-551-3680 with any questions.



                                                            Sincerely,

                                                            Division of
Corporation Finance
                                                            Office of
Healthcare & Insurance