THE PIONEER GROUP, INC.
60 State Street
Boston, MA 02109-1820
617-742-7825
February 2, 1998
VIA ELECTRONIC TRANSMISSION
Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street, NW
Washington, DC 20549
Re: Pioneer Mid-Cap Fund (the "Fund")
(File Nos. 2-79140 and 811-07525)
CIK NO. 0000706155
Ladies and Gentlemen:
Pursuant to Rule 497(j) under the Securities Act of 1933, as
amended, I certify that the form of prospectus and statement of additional
information that would have been filed under paragraph (c) of Rule 497 does not
differ from that contained in Post-Effective Amendment No. 23 to the Fund's
registration statement on Form N-1A filed electronically (Accession No.
0001016964-98-000002) on January 28, 1998.
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. Tracey Howard
Mr. Joseph P. Barri
Mr. Mark P. Goshko
Ms. Michelle Rhee
g:\edgar\final\98\497jmid.txt
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Pioneering Management Corporation Pioneer Capital Corporation
Pioneer Funds Distributor, Inc. Teberebie Goldfields Limited
Pioneering Services Corporation Pioneer Metals and Technology, Inc.
