Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the Arthur J. Gallagher & Co. 2022 Long-Term Incentive Plan of Arthur J. Gallagher & Co. of our reports dated February 18, 2022, with respect to the consolidated financial statements and schedule of Arthur J. Gallagher & Co. and the effectiveness of internal control over financial reporting of Arthur J. Gallagher & Co. included in its Annual Report (Form 10-K) for the year ended December 31, 2021, filed with the Securities and Exchange Commission.
| /s/ Ernst & Young LLP |
| Ernst & Young LLP |
Chicago, Illinois
November 15, 2022
