Douglas George Grimston was a Canadian ice hockey administrator who served as president of the Canadian Amateur Hockey Association (CAHA) from 1950 to 1952. He oversaw the establishment of the Major Series for the Alexander Cup and implemented a new deal for player contracts in senior ice hockey, in response to the Allan Cup championship being dominated by a small group of teams who sought to protect themselves from professional leagues recruiting their players. He opposed the National Hockey League wanting its junior ice hockey prospect players on stronger teams, which led to limits on the transfer of players to keep balanced competition for the Memorial Cup. After the 1952 Winter Olympics where the Canada men's national ice hockey team won the gold medal, Grimston recommended withdrawal from Olympic hockey since European nations would never agree to ice hockey rules which allowed physical play. Grimston later accused International Ice Hockey Federation vice-president Bunny Ahearne of financially exploiting of the Edmonton Mercurys on a European tour, which led to a physical altercation between them.