Johnson Controls International (JCI) S-3ASR Automatic shelf registration

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on FormS-3 of Johnson Controls International plcof our report dated November 21, 2019relating to the consolidated financial statements, financial statement schedule and the effectiveness of internal control over financial reporting, which appears in Johnson Controls International plc’s Annual Report on Form10-K for the year ended September 30, 2019. We also consent to the reference to us under the heading “Experts” in such Registration Statement.

/s/ PricewaterhouseCoopers LLP

Milwaukee, Wisconsin

January 31, 2020

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