The National Hockey Association (NHA), initially the National Hockey Association of Canada Limited, was a professional ice hockey organization with teams in Ontario and Quebec, Canada. It is the direct predecessor of today's National Hockey League (NHL), and much of the business processes of the NHL today are based on the NHA. Founded in 1909 by Ambrose O'Brien, the NHA introduced 'six-man hockey' by removing the 'rover' position in 1911. During its lifetime, the league coped with competition for players with the rival Pacific Coast Hockey Association (PCHA), the enlistment of players for World War I and disagreements between owners. The disagreements between owners came to a head in 1917, when the NHA suspended operations in order to get rid of an unwanted owner, Eddie Livingstone.

The Pacific Coast Hockey Association (PCHA) was a professional ice hockey league in western Canada and the western United States, which operated from 1911 to 1924 when it then merged with the Western Canada Hockey League (WCHL). The PCHA was considered to be a major league of ice hockey and was important in the development of the sport of professional ice hockey through its innovations.