The Polo Park Racetrack was a Canadian horse racing facility in Winnipeg, Manitoba. Considered one of the finest racetracks in Western Canada, it was built by Canadian Horse Racing Hall of Fame inductee R. James Speers. The six-furlong track opened in 1925 under the charter of the Winnipeg Jockey Club and the charter of St. Vital Agricultural Society in Winnipeg, Manitoba. At the same time, James Speers founded the Prairie Thoroughbred Breeders' Association to promote a breeding industry in Western Canada. In 1930 he created the Canadian Derby, a premier race for Canadian-bred three-year-old Thoroughbreds hosted by Polo Park Racetrack until its closure in 1956.