Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the following Registration Statements:

(1) Form S-8 No. 333-136132 pertaining to the National Technical Systems, Inc. 2006 Equity Incentive Plan,

(2) Form S-8 No. 333-106426 pertaining to the National Technical Systems, Inc. 2002 Stock Option Plan,

(3) Form S-8 No. 333-106425 pertaining to the National Technical Systems, Inc. 1994 Stock Option Plan,

(4) Form S-8 No. 333-04905 pertaining to the National Technical Systems, Inc. 1994 Stock Option Plan, and

(5) Form S-3 No. 333-175418 pertaining to shares acquired by Mill Road Capital;

of our report dated April 30, 2012, with respect to the consolidated financial statements and schedule of National Technical Systems, Inc. included in this Annual Report (Form 10-K) of National Technical Systems, Inc. for the year ended January 31, 2012.

/s/ Ernst & Young LLP

Los Angeles, California

April 30, 2012