Robert Lucius Harrison, Jr. (born August 8, 1937 in Stamford, Texas) is a former American football defensive lineman in the National Football League for the San Francisco 49ers, the Philadelphia Eagles, and the Pittsburgh Steelers. He played college football at the University of Oklahoma and was drafted in the second round of the 1959 NFL Draft. Bob Harrison later coached the Washington Commandos of the Arena Football League in their first season of 1987. He retired after that year.