John "Mopsy" Rantall (born 9 December 1943) is a former Australian rules footballer who played for the South Melbourne Football Club, North Melbourne Football Club and Fitzroy Football Club in the Victorian Football League (VFL). A lightly-built defender who consistently held his own against many of the VFL's best forwards, Rantall was an inaugural inductee into the Australian Football Hall of Fame in 1996. He is a member of both the North Melbourne and Swans Team of the Century.