Rex William Kern (born May 28, 1949) is a former American football player. He played professional football in the National Football League at defensive back for the Baltimore Colts and Buffalo Bills. In college, Kern was the quarterback for the Ohio State Buckeyes from 1968 to 1970; the Buckeyes went undefeated in 1968 and were national champions. Kern was inducted into the College Football Hall of Fame in 2007.