Phio Pharmaceuticals Corp.

257 Simarano Drive, Suite 101 | Marlborough, MA 01752

May 19, 2021

VIA EDGAR

Securities and Exchange Commission

Division of Corporation Finance

100 F Street, N.E.

Washington, DC 20549

Attn: Jeff Gabor

Re:	Phio Pharmaceuticals Corp.
	Registration Statement on Form S-3 (File No. 333-256100)

Ladies and Gentlemen:

Pursuant to Rule 461 under the Securities Act of 1933, as amended, Phio Pharmaceuticals Corp. (the “Company”) hereby respectfully requests that the effective date of the above-referenced registration statement on Form S-3 filed by the Company (the “Registration Statement”) be accelerated so that it will be declared effective at 5:00 p.m., Eastern Time, on May 21, 2021, or as soon thereafter as practicable.

Very truly yours,

PHIO PHARMACEUTICALS CORP.

/s/ Gerrit Dispersyn                             

Gerrit Dispersyn, Dr. Med. Sc.

President and Chief Executive Officer

cc: Ryan A. Murr, Gibson, Dunn & Crutcher LLP