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United States securities and exchange commission logo





                            December 3, 2020

       Martin K. Birmingham
       President and Chief Executive Officer
       Financial Institutions, Inc.
       220 Liberty Street
       Warsaw, NY 14569

                                                        Re: Financial
Institutions, Inc.
                                                            Registration
Statement on Form S-4
                                                            Filed November 30,
2020
                                                            File No. 333-251030

       Dear Mr. Birmingham:

              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 Eric
Envall at (202) 551-3234 with any questions.




                            Sincerely,


                            Division of Corporation Finance

                            Office of Finance
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