Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Amendment No. 2 to Registration Statement No. 333-140018 on Form S-3 of our reports dated December 7, 2006, relating to the consolidated financial statements of Innovative Solutions and Support, Inc., and management’s report on the effectiveness of internal control over financial reporting, appearing in the Annual Report on Form 10-K of Innovative Solutions and Support, Inc. for the year ended September 30, 2006 and to the reference to us under the heading “Experts” in the Prospectus, which is part of this Registration Statement.

DELOITTE & TOUCHE LLP

Philadelphia, Pennsylvania
April 23, 2007