Robert Clayton Groff[1] (born January 31, 1966, in Mission Hills, California), is a former driver in the Indy Racing League and CART Championship Car series and is brother of Mike Groff. He raced in the 1994 CART season and 1997-1998 IRL seasons with 9 combined starts. His best career finish was in his first race, a ninth place at the 1997 Indianapolis 500.