John Willard Hadl (born February 15, 1940) is a former collegiate and professional football player. Hadl was born in Lawrence, Kansas. After playing halfback on both offense and defense at the University of Kansas as a sophomore, Hadl played quarterback for his last two years at Kansas, and was selected as the school's Player of the Century. He was an All American at running back in 1960 and at quarterback in 1961. He was elected to the College Football Hall of Fame in 1994.