Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in Amendment No. 1 to the Registration Statement on Form S-1 (File No. 333-218872) of PhaseRx, Inc. of our report dated March 27, 2017, on our audits of the consolidated financial statements of PhaseRx, Inc. as of December 31, 2016 and 2015, and for the years then ended. We also consent to the reference to us under the heading "Experts" in the Registration Statement.
/S/ PETERSON SULLIVAN LLP
Seattle, Washington
July 5, 2017
