Richard J. Karth (born December 13, 1952) is an American professional historic motorsport and stock car racing driver. As a vintage racer, he pilots the No. 90 formerly owned by Donlavey Racing in conjunction with the Midwestern Council of Sports Car Clubs. He last competed part-time in the NASCAR Xfinity Series, driving the No. 61 Chevrolet Camaro for MBM Motorsports.