Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of Seres Therapeutics, Inc.of our report dated March 6, 2019relating to the financial statements, which appears in Seres Therapeutics, Inc.‘s Annual Report on Form10-K for the year ended December 31, 2018.
/s/ PricewaterhouseCoopers LLP
Boston, Massachusetts
March 6, 2019