Robert J. Ptacek, Jr. (born April 23, 1937) is a former professional American and Canadian football player. He played college football at the halfback and quarterback positions for the University of Michigan from 1956 to 1958. He later played professional football in the National Football League (NFL) for the Cleveland Browns in 1959 and in the Canadian Football League (CFL) for the Saskatchewan Roughriders from 1960 to 1965. He was a CFL All-Star in 1964 as a defensive back and an All-Western Conference linebacker in 1961.