PIONEER MID CAP FUND, 497J, 1997-02-04

PIONEER MID CAP FUND
497J, 1997-02-04

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                              PIONEER MID-CAP FUND 
                                60 State Street
                                Boston, MA 02109


                                                          February 4, 1997


VIA ELECTRONIC TRANSMISSION

Securities and Exchange Commission
File Desk
Judiciary Plaza
450 Fifth Street, NW
Washington, DC  20549

Re:           Pioneer Mid-Cap Fund (the "Fund")
              File Nos. 2-79140 and 811-3564
              CIK No. 0000706155

Ladies and Gentlemen:

              Pursuant to Rule 497(j)  under the  Securities  Act of 1933,  this
letter  certifies that the  Prospectus  and Statement of Additional  Information
that would have been  required to be filed under  paragraph (c) of Rule 497 does
not differ from that contained in the  Post-Effective  Amendment,  dated January
28,  1997,  and that the text of the Post  -Effective  Amendment  has been filed
electronically, Accession No. 0000706155-97-000004.

              If you have any  questions or comments  concerning  the  enclosed,
please contact me at (617) 742-7825 (collect).

                                                          Very truly yours,


                                                        /s/ Patricia M. Ballard
                                                        Patricia M. Ballard
                                                        Paralegal
cc:           Ms. Elizabeth Watson
              Mses. Rajotte/Alves
              Joseph P. Barri, Esq.
              Mark Goshko, Esq.
              Michael P. Scanlon, Esq.