Blackstone (BX) S-8 Registration of securities for employees

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated March 1, 2018, relating to the consolidated financial statements of The Blackstone Group L.P. and subsidiaries (“Blackstone”) and the effectiveness of Blackstone’s internal control over financial reporting,appearing in the Annual Report on Form 10-K of Blackstone for the year ended December 31, 2017.

/s/ Deloitte & Touche LLP

New York, New York

March 1, 2018