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                      March 14, 2022

       Mary Jane Raymond
       Chief Financial Officer
       II-VI INC
       375 Saxonburg Blvd.
       Saxonburg, PA 16056

                                                        Re: II-VI INC
                                                            Form 10-K for the
Fiscal Year Ended June 30 , 2021
                                                            File No. 001-39375

       Dear Ms. Raymond:

              We have completed our review of your filing. 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.




                      Sincerely,


                      Division of Corporation Finance

                      Office of Life Sciences