Harold Roy Killin (born 18 July 1929), known as Roy Killin, is a former professional footballer who played as a full back in the Football League for Manchester United and Lincoln City. and finally with Peterborough United from 1954 to 1958. In 1947 he began playing for Manchester United Junior teams. In 1949 he became a full professional playing mainly in the reserve and "A" teams. He had no first team appearances.