Greif (GEF) 10-K 2019 FY Annual report

EXHIBIT 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 333-26767, 333-26977, 333-35048, 333-61058, 333-61068, 333-123133, and 333-151475 on Form S-8 of our reports dated December 18, 2019, relating to the consolidated financial statements and financial statement schedule of Greif, Inc. and subsidiary companies, and the effectiveness of Greif, Inc. and subsidiary companies’ internal control over financial reporting, appearing in the Annual Report on Form 10-K of Greif, Inc. and subsidiary companies for the year ended October 31, 2019.

/s/ Deloitte & Touche LLP

Columbus, Ohio

December 18, 2019