These events occured in 1917 in the world of hockey:
Allan Cup – Toronto Dentals
17–26 March — Seattle Metropolitans (PCHA) defeats Montreal Canadiens (NHA) in the 1917 Stanley Cup Finals by 3 games to 1
- 10 November — after Eddie Livingston, owner of the Toronto NHA team, refuses to sell, the NHA votes to suspend operations
- 26 November — in a secret meeting, several owners of the NHA form the National Hockey League (NHL) to force out the owner of the Toronto Blueshirts NHA team. Toronto's Arena Gardens will operate a temporary franchise in Toronto while Quebec Bulldogs becomes a NHL member but is suspended for the inaugural season.
19 December — the opening NHL games are played to begin the new league's inaugural season