Leighton Alfred Emms (January 12, 1905 – October 23, 1988) was a Canadian ice hockey player, coach, team owner, and general manager, during nearly 60 years in hockey. Emms played 17 seasons of professional hockey as a left winger and a defenceman, including 10 seasons and 320 games in the National Hockey League. After playing, Emms had a 33-year presence in the Ontario Hockey Association, as the owner of the Barrie Flyers, Niagara Falls Flyers, and St. Catharines Black Hawks between 1945 and 1978. Teams that Emms coached or owned appeared in eight Memorial Cup tournaments, winning four Memorial Cups. He was nicknamed "Happy Emms" due to the sour look on his face, which was later shortened to "Hap Emms".