Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement in Form S-3 of 4Front Ventures Corp. of our report dated March 30, 2023, relating to the consolidated financial statements, appearing in the Annual Report of Form 10 K of 4Front Ventures Corp. for the year ended December 31, 2022.

We also consent to the reference to us under the caption “Experts” in this Registration Statement.

/s/ DAVIDSON & COMPANY LLP

Vancouver, Canada Chartered Professional Accountants

December 15, 2023

1200 - 609 Granville Street, P.O. Box 10372, Pacific Centre, Vancouver, B.C., Canada V7Y 1G6

Telephone (604) 687-0947 Davidson-co.com