Exhibit (23) to Report

On Form 10-K for Fiscal

Year Ended June 30, 2012

By Parker-Hannifin Corporation

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-169069), and Form S-8 (Nos. 033-53193, 333-95477, 333-34542, 333-103181, 333-103633, 333-107691, 333-117761, 333-126957, 333-130123, and 333-164335) of our report dated August 24, 2012, relating to the financial statements and the financial statement schedule of Parker-Hannifin Corporation and subsidiaries (the “Company”), and the effectiveness of the Company’s internal control over financial reporting, appearing in this Annual Report on Form 10-K of the Company for the year ended June 30, 2012.

/s/ DELOITTE & TOUCHE LLP

Cleveland, OH

August 24, 2012