Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the Greenhill & Co., Inc. 2019 Equity Incentive Plan of Greenhill & Co., Inc. of our reports dated February 28, 2019, with respect to the consolidated financial statements of Greenhill & Co., Inc. and the effectiveness of internal control over financial reporting of Greenhill & Co., Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 2018, filed with the Securities and Exchange Commission.

/s/ Ernst and Young LLP

New York, New York

August 2, 2019