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Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements, as listed below, of our reports dated February 17, 2026, with respect the consolidated financial statements and related financial statement schedule of Arthur J. Gallagher & Co., and the effectiveness of internal control over financial reporting of Arthur J. Gallagher & Co., included in this Annual Report (Form 10-K) of Arthur J. Gallagher & Co. for the year ended December 31, 2025.

Form			Registration Statement No.			Description
Form S-8			333-87320 and 333-106535			Arthur J. Gallagher & Co. 1988 Nonqualified Stock Option Plan and Arthur J. Gallagher & Co. Non-Employee Directors’ Stock Option Plan
Form S-8			333-106539			Arthur J. Gallagher & Co. Restricted Stock Plan
Form S-8			333-174497			Arthur J. Gallagher & Co. 2011 Long-Term Incentive Plan
Form S-8			333-197898			Arthur J. Gallagher & Co. 2014 Long-Term Incentive Plan, Arthur J. Gallagher & Co. Deferred Equity Participation Plan, Arthur J. Gallagher & Co. Deferred Cash Participation Plan and Arthur J. Gallagher & Co. Supplemental Savings and Thrift Plan
Form S-8			333-204976			Arthur J. Gallagher & Co. Employee Stock Purchase Plan
Form S-8			333-221274			Arthur J. Gallagher & Co. 2017 Long-Term Incentive Plan, Arthur J. Gallagher & Co. Deferred Equity Participation Plan, Arthur J. Gallagher & Co. Deferred Cash Participation Plan and Arthur J. Gallagher & Co. Supplemental Savings and Thrift Plan
Form S-8			333-252830			Arthur J. Gallagher & Co. Employees’ 401(k) Savings and Thrift Plan
Form S-8			333-258331			Arthur J. Gallagher & Co. UK Employee Share Incentive Plan
Form S-3			333-277002			Debt Securities, Guarantees, Common Stock, Preferred Stock, Warrants, Depositary Shares, Purchase Contracts, and Units
Form S-4			333-203203, 333-214617 and 333-268400			Shares of Common Stock
Form S-8			333-262899			Arthur J. Gallagher & Co. Employees’ 401(k) Savings and Thrift Plan and Arthur J. Gallagher & Co. Supplemental Savings and Thrift Plan
Form S-8			333-268401			Arthur J. Gallagher & Co. 2022 Long-Term Incentive Plan
Form S-8			333-273703			Arthur J. Gallagher & Co. Deferred Equity Participation Plan, Arthur J. Gallagher & Co. Deferred Cash Participation Plan and Arthur J. Gallagher & Co. Supplemental Savings and Thrift Plan
Form S-3			333-283677			Shares of Common Stock
Form S-8			333-285019			Arthur J. Gallagher & Co. Employees’ 401(k) Savings and Thrift Plan, Arthur J. Gallagher & Co. Supplemental Savings and Thrift Plan, and Stand Alone Restricted Stock Unit Inducement Awards

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/s/ Ernst & Young LLP
Ernst & Young LLP

Chicago, Illinois

February 17, 2026