Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

The Board of Directors

Rapid7, Inc.:

We consent to the use of our report dated February 24, 2022, with respect to the consolidated balance sheets of Rapid7, Inc. and subsidiaries (the Company) as of December 31, 2021 and 2020, the related consolidated statements of operations, comprehensive loss, changes in stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2021, and the related notes, and the effectiveness of internal control over financial reporting as of December 31, 2021, incorporated by reference herein.

Our report refers to the Company’s adoption of Accounting Standards Update 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40) as of January 1, 2021.

/s/ KPMG LLP

Boston, Massachusetts

February 24, 2022