[MoSys, Inc. Letterhead]

October 25, 2017

U.S. Securities and Exchange Commission

Division of Corporate Finance

100 F Street NE

Washington, DC  20549

Attn: Timothy Buchmiller

Re:MoSys, Inc.

Form S-3

File No. 333-221011

Ladies and Gentlemen:

Pursuant to Rule 461 promulgated under the Securities Act of 1933, as amended, MoSys, Inc. (the “Registrant”) hereby requests that the effective date for the above-referenced Registration Statement on Form S-3 be accelerated so that it will be declared effective at 5:00 p.m., Eastern Daylight Time, on Thursday,  October 26, 2017, or as soon as thereafter as practicable.

The Registrant acknowledges that (1) should the Securities and Exchange Commission (the “Commission”) or the taff, acting pursuant to delegated authority, declare the filing effective, it does not foreclose the Commission from taking any action with respect to the filing; (2) the action of the Commission or the staff, acting pursuant to delegated authority, in declaring the filing effective, does not relieve the Registrant from its full responsibility for the adequacy and accuracy of the disclosure in the filing; and (3) the Registrant may not assert staff comments and the declaration of effectiveness as a defense in any proceeding initiated by the Commission or any person under the federal securities laws of the United States.

Very Truly Yours,
MoSys, Inc.
By:	/s/ James W. Sullivan
	Name:	James W. Sullivan
	Title:	Vice President of Finance and
		Chief Financial Officer