Exhibit 23 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We have issued our report dated March 11, 2005, accompanying the consolidated financial statements and schedule included in the Annual Report of SL Industries, Inc. and its subsidiaries on Form 10-K for the three years ended December 31, 2004. We hereby consent to the incorporation by reference of said report in the Registration Statements of SL Industries, Inc. and its subsidiaries on Form S-8 (File No. 333-53274, effective June 18, 1996, File No. 333-00269, effective February 6, 1996, File No. 033-63681, effective November 13, 1995, File No. 033-65446, effective January 16, 1996, and File No. 333-73407, effective March 5, 1995). /s/ GRANT THORNTON LLP Philadelphia, Pennsylvania March 11, 2005