THE PIONEER GROUP, INC.
60 State Street
Boston, MA 02109-1820
617-742-7825
[Pioneer logo]
March 2, 2000
VIA ELECTRONIC TRANSMISSION
Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street, NW
Washington, DC 20549
Re: Pioneer Mid-Cap Value Fund (the "Fund")
(File Nos. 33-34801 and 811-06106)
CIK No. 0000863334
Ladies and Gentlemen:
Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, I
certify that the forms of prospectus and statement of additional information
that would have been filed under paragraph (c) of Rule 497 do not differ from
those contained in Post-Effective Amendment No. 15 to the Fund's registration
statement on Form N-1A filed electronically (Accession No. 0001016964-00-000032)
on February 28, 2000.
If you have any questions about this certification, please contact
me at (617) 422-4966 (collect).
Very truly yours,
/s/ Mark Pietkiewicz
Mark Pietkiewicz
Senior Legal Product Manager
cc: Ms. Victoria J. Caviasca
Mr. Joseph P. Barri
Mr. David C. Phelan
Mr. Mr. Timothy F. Silva
