John Scott Bull (born June 8, 1953) is a former professional football player, spending three seasons as a quarterback with the San Francisco 49ers. He played college football at the University of Arkansas. In his NFL career, Bull completed 76 of 193 passes for 3 touchdowns. A strong running quarterback, he rushed for 186 yards in 46 attempts and three touchdowns in his three-year professional career. Bull saw his most extensive action in 1978. He spent 1979 on injured reserve with a knee injury suffered in the final game of the 1978 season.