Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

The Board of Directors of Open Text Corporation:

We consent to the use of:

•our report dated July 31, 2024 on the consolidated financial statements of Open Text Corporation (the “Company”) which comprise the consolidated balance sheets as at June 30, 2024 and June 30, 2023, the related consolidated statements of income, comprehensive income, shareholders’ equity and cash flows for each of the years in the three-year period ended June 30, 2024, and the related notes, and

•our report dated July 31, 2024 on the effectiveness of the Company’s internal control over financial reporting as of June 30, 2024

each of which is included in the Annual Report on Form 10-K of the Company for the fiscal year ended June 30, 2024.

/s/ KPMG LLP

September 13, 2024

Toronto, Canada