James William "Bill" George Roycroft, OBE (17 March 1915 – 29 May 2011) was an Australian Olympic equestrian champion. He grew up on a dairy farm and learnt to ride horses there. After serving in the army in World War II, he moved with his family to a soldier's block in western Victoria near Camperdown, where he raised his three sons, all of whom went on to compete alongside their father in the Olympics.