August 21, 2000
Securities and Exchange Commission
450 Fifth Street, N.W.
Judiciary Plaza
Washington, D.C. 20549
Attention: Division of Investment Management
Re: Merrill Lynch Funds for Institutions
Series Post-Effective Amendment No.
21 to the Registration Statement on Form
N-1A (Securities Act File No. 33-14190
Investment Company Act File No. 811-5149)
Ladies and Gentlemen:
Pursuant to Rule 497 (j) under the Securities Act
of 1933, as amended (the "1933 Act"), Merrill Lynch
Funds for Institutions Series (the "Trust") hereby
certifies that:
(1) the form of prospectus and statement of additional
information that would have been filed pursuant to
Rule 497 (c) under the 1933 Act would not have
differed from that contained in Post-Effective
Amendment No. 21 to the Trust's Registration Statement
on Form N-1A, constituting the most recent amendment
to the Trust's Registration Statement on Form N-1A;
and
(2) the text of Post-Effective Amendment No.21 to the
Trust's Registration Statement on Form N-1A was filed
electronically with the Securities and Exchange
Commission on August 17, 2000.
Very truly yours,
Merrill Lynch Funds for Institutions Series
By: Terry K. Glenn /s/
_________________________
Terry K. Glenn
President
