September 8, 2025

Neil Warma
Chief Executive Officer
ProMIS Neurosciences Inc.
Suite 200, 1920 Yonge Street
Toronto, Ontario M4S 3E2

       Re: ProMIS Neurosciences Inc.
           Registration Statement on Form S-3
           Filed September 4, 2025
           File No. 333-290039
Dear Neil Warma:

       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 Jason Drory at 202-551-8342 with any questions.



                                                           Sincerely,

                                                           Division of
Corporation Finance
                                                           Office of Life
Sciences
cc:   Adam Johnson