May 21, 2019

Jill C. Milne, Ph.D.
President and Chief Executive Officer
Catabasis Pharmaceuticals, Inc.
One Kendall Square
Bldg. 1400E, Suite B14202
Cambridge, MA 02139

       Re: Catabasis Pharmaceuticals, Inc.
           Registration Statement on Form S-3
           Filed May 14, 2019
           File No. 333-231441

Dear Dr. Milne:

       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 Christine Westbrook at 202-551-5019 with any questions.



                                                            Sincerely,

                                                            Division of
Corporation Finance
                                                            Office of
Healthcare & Insurance
cc:    Rosemary G. Reilly, Esq.