John G. Hayes, Sr. (July 17, 1919 – December 8, 1998), was a harness racing driver/trainer/owner who was inducted into the Canadian and American Harness Racing Halls of Fame. Born in Oshawa, Ontario, Canada, he was the son of a dairy farmer who went on to become a prominent figure in harness racing and the first Canadian to be selected to the Little Brown Jug's Wall of Fame. His greatest accomplishment was in training horses in particular when he developed the great champion, Strike Out.