These events occured in 1903 in the world of hockey:
- Montreal HC defeats Winnipeg Victorias three games to one in a cup challenge.
- Montreal HC and Ottawa HC tie for first place in the Canadian Amateur Hockey League (CAHL) regular season with 6–2 records. The teams play off for the CAHL championship and Stanley Cup. Ottawa defeats Montreal 9–1 in a two-game, total-goals series to win its first Stanley Cup title.
- Ottawa HC defeats Rat Portage Thistles two games to nil in another cup challenge.
- First ice hockey league in Europe begins, contested by five teams from Princes Skating Club and Hengler's Ice Rink, both in London.