Defunct ice hockey leagues in Canada

The Canadian Professional Hockey League, also known as Can-Pro, was a minor professional hockey league founded in 1926. After three seasons, it became the International Hockey League in 1929. The name was then given to a new league of IHL farm teams which operated in the 1929–30 season.

The International Hockey League was a professional hockey league operating in Canada and the United States from 1929 to 1936. It is one of two direct ancestors of the American Hockey League.

The Western International Hockey League (WIHL) was a senior level ice hockey league that featured teams from the Western United States and Western Canada. It operated from 1946–62 and 1963–88. It grew out of the West Kootenay League, which operated in southeast British Columbia from the 1920s.

The United Hockey League (UHL), originally known as the Colonial Hockey League from 1991 to 1997 and last known as the International Hockey League from 2007 to 2010, was a low-level minor professional ice hockey league, with teams in the United States and Canada. The league was headquartered in Rochester, Michigan, and, in its last year, consisted of seven teams. It folded in 2010, with most of its teams joining the Central Hockey League. The Central Hockey League teams still operating in 2014 were then added to ECHL. The only former CoHL/UHL/IHL teams still active as of 2018 are the Fort Wayne Komets and Kalamazoo Wings.

The World Hockey Association (French: Association mondiale de hockey) was a professional ice hockey major league that operated in North America from 1972 to 1979. It was the first major league to compete with the National Hockey League (NHL) since the collapse of the Western Hockey League in 1926. Although the WHA was not the first league since that time to attempt to challenge the NHL's supremacy, it was by far the most successful in the modern era.

The Canadian Hockey Association (CHA) was an early men's professional ice hockey league. It was founded in November, 1909, as the result of a dispute within the Eastern Canada Hockey Association. The CHA survived only a few weeks of play in January 1910 before two teams jumped to the new National Hockey Association (NHA), itself a seven-week-old league, causing dissolution of the CHA.

The International Professional Hockey League (IPHL) was the first fully professional Ice hockey league, operating from 1904 to 1907. It was formed by Jack 'Doc' Gibson, a dentist who played hockey throughout Ontario before settling in Houghton, Michigan. The IPHL was a five team circuit which included Pittsburgh, Pennsylvania, Sault Ste. Marie, Ontario, Sault Ste. Marie, Michigan, Calumet, Michigan and Houghton. The IPHL was instrumental in changing the nature of top-level senior men's ice hockey from amateur to professional.

The Pacific Coast Hockey League was an ice hockey minor league with teams in the western United States and western Canada that existed in several incarnations: from 1928 to 1931, from 1936 to 1941, and from 1944 to 1952.

The Eastern Canada Amateur Hockey Association (ECAHA) was a men's amateur – later professional – ice hockey league in Canada that played four seasons. It was founded on December 11, 1905 with the top clubs from two other leagues: four from the Canadian Amateur Hockey League (CAHL) and two from the Federal Amateur Hockey League (FAHL). It was formed to maximize the revenues of a now popular spectator sport and help these amateur teams cope with professionalism in the sport. The league would shed its amateur status for the 1908 season, leading to the split between Canadian amateur ice hockey teams playing for the Allan Cup, and the professionals playing for the Stanley Cup. The league would itself dissolve in 1909 over a dispute between team owners over business issues.

The Federal Amateur Hockey League (FAHL) was a Canadian men's senior-level ice hockey league that played six seasons, from 1904 to 1909. The league was formed initially to provide a league for teams not accepted by the rival Canadian Amateur Hockey League (CAHL).