EXHIBIT 23

CONSENT OF INDEPENDENT

REGISTERED PUBLIC ACCOUNTING FIRM

Blonder Tongue Laboratories, Inc.

We hereby consent to the incorporation by reference in Registration Statement Nos. 333-15039, 333-52519, 333-37670, 333-96993, 333-111367 and 333-126064 of Blonder Tongue Laboratories, Inc. on Form S-8, and Registration Statement No. 333-53045 of Blonder Tongue Laboratories, Inc. on Form S-3, of our reports dated April 12, 2005, relating to the consolidated financial statements and schedule of Blonder Tongue Laboratories, Inc. included in the Company’s Annual Report on Form 10-K/A for the year ended December 31, 2004.

BDO Seidman, LLP

/s/ BDO Seidman, LLP

Woodbridge, New Jersey

September 1, 2005