Prospectus Certification by Investment Company (Form 497J)

COVER LETTER

April 25, 2025

Securities and Exchange Commission

100 F Street, NE

Washington, DC 20549

RE:	MML Series Investment Fund (the "Trust")
	(1933 Act File No. 2-39334; 1940 Act File No. 811-02224)

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, please accept this letter as certification that the Prospectuses and Statements of Additional Information for the Trust do not differ from those contained in Post-Effective Amendment No. 118 to the Trust's Registration Statement on Form N-1A which was filed electronically on April 24, 2025.

Please address any questions or comments to the undersigned at (413) 744-0762.

Very truly yours,

/s/Andrew M. Goldberg
Andrew M. Goldberg

Lead Counsel, Investment Adviser & Mutual Funds, Massachusetts Mutual Life Insurance Company

Vice President, Secretary, and Chief Legal Officer, MML Series Investment Fund