Knoll (KNL) S-3ASR Automatic shelf registration

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the reference to our firm under the caption “Experts” in the Registration Statement (Form S-3) and related Prospectus of Knoll, Inc., for the registration of shares of its common stock and to the incorporation by reference therein of our reports dated March 1, 2021, with respect to the consolidated financial statements of Knoll, Inc., and the effectiveness of internal control over financial reporting of Knoll, Inc., included in its Annual Report (Form 10-K) for the year ended December 31, 2020 filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

Philadelphia, Pennsylvania

March 1, 2021