John "Rocky" Ryan (July 5, 1932 – November 3, 2011) was an American professional football player who was a defensive back in the National Football League (NFL) in the late 1950s. Ryan played college football for the University of Illinois at Urbana-Champaign. He was selected in the second round of the 1954 NFL Draft, and played professionally for the Philadelphia Eagles and Chicago Bears of the NFL.