QuickLinks -- Click here to rapidly navigate through this document

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

        We consent to the use in this Amendment No. 2 to the Registration Statement (File No. 333-232731) (the "Registration Statement") on Form F-1 of our report dated September 12, 2019 relating to the consolidated financial statements of GFL Environmental Holdings Inc. (new) and subsidiaries ("Successor") as of December 31, 2018 and of GFL Environmental Holdings Inc. (old) and subsidiaries ("Predecessor") as of December 31, 2017 and for the period from June 1, 2018 to December 31, 2018 (Successor), the period from January 1, 2018 to May 31, 2018 and the years ended December 31, 2017 and 2016 (Predecessor) appearing in the Prospectus, which is a part of this Registration Statement, and to the references to us under the heading "Experts" in such Prospectus.

/s/ Deloitte LLP
Chartered Professional Accountants
Licensed Public Accountants
Toronto, Canada
September 12, 2019

QuickLinks

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM