Exhibit 99.4

	KPMG LLP Bay Adelaide Centre 333 Bay Street, Suite 4600 Toronto, ON M5H 2S5 Canada Tel 416-777-8500 Fax 416-777-8818

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors of Bank of Montreal:

We consent to the use of the following reports that are included in this annual report on Form 40-F:

i) our report of independent registered public accounting firm dated December 3, 2021 to the Shareholders and the Board of Directors of Bank of Montreal (the “Bank”) on the consolidated financial statements of the Bank, which comprise the consolidated balance sheets as at October 31, 2021 and October 31, 2020, the related consolidated statements of income, comprehensive income, changes in equity and cash flows for each of the years in the three-year period ended October 31, 2021, and the related notes; and

ii) our report of independent registered public accounting firm dated December 3, 2021 to the Shareholders and the Board of Directors of the Bank on the effectiveness of internal control over financial reporting as of October 31, 2021.

each of which is contained in this annual report on Form 40-F of the Bank for the fiscal year ended October 31, 2021.

We also consent to the use of the above-mentioned reports, which are incorporated by reference, and to the reference to our firm under the heading “Experts”, in the following Registration Statements of the Bank:

1. Registration Statement – Form F-3 – File No. 333-237342

2. Registration Statement – Form F-3 – File No. 333-214934

We also consent to the use of the above-mentioned reports which are incorporated by reference in the following Registration Statements of the Bank:

1. Registration Statement – Form S-8 – File No. 333-191591

2. Registration Statement – Form S-8 – File No. 333-180968

3. Registration Statement – Form S-8 – File No. 333-177579

4. Registration Statement – Form S-8 – File No. 333-177568

5. Registration Statement – Form S-8 – File No. 333-176479

6. Registration Statement – Form S-8 – File No. 333-175413

7. Registration Statement – Form S-8 – File No. 333-175412

8. Registration Statement – Form S-8 – File No. 333-113096

9. Registration Statement – Form S-8 – File No. 333-14260

10. Registration Statement – Form S-8 – File No. 33-92112

11. Registration Statement – Form S-8 – File No. 333-207739

12. Registration Statement – Form S-8 – File No. 333-237522

/s/ KPMG LLP

Chartered Professional Accountants, Licensed Public Accountants

December 3, 2021

Toronto, Canada

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