NORTHWESTERN MUTUAL LIFE
720 East Wisconsin Avenue
Milwaukee, WI 53202
414-299-7369
May 7, 1998
Securities and Exchange Commission
Division of Investment Management
Judiciary Plaza
450 Fifth Street, N.W.
Washington, D.C. 20549
Re: Northwestern Mutual Series Fund, Inc.
File No. 2-89971
EDGAR CIK: 0000742212
Gentlemen:
Pursuant to Rule 497(j) under the Securities Act of 1933,
please accept this letter as certification that the Prospectus
and Statement of Additional Information dated April 30, 1998 for
the above-referenced entity do not differ from that contained in
Post-Effective Amendment No. 15 (the "Amendment") to the
Registration statement on Form N-1A. This Amendment was filed
electronically on April 28, 1998.
Any comments on this filing should be directed to Merrill C.
Lundberg, Assistant General Counsel, at 414-299-7369.
This filing is being effected by direct transmission to the
Commission's EDGAR System.
Very truly yours,
/s/Sara A. Holm
Paralegal Specialist
HOL03 : 101230
