These events occured in 1925 in the world of hockey:
- 21–30 March — Victoria Cougars defeats Montreal Canadiens in the 1925 Stanley Cup Finals. The Cougars are the last non-NHL team to win the Cup.
- The first-place Hamilton Tigers of the NHL go on strike for an increase in pay. The team is suspended and the players sold to become the New York Americans.
- 2 December — the expansion New York Americans and Pittsburgh Pirates of the NHL play their first-ever game against each other at Pittsburgh. The Americans defeat the Pirates 2-1 in overtime.
- 15 December — the first NHL game is played at Madison Square Garden between the New York Americans and the Montreal Canadiens. The Canadiens win the game 3-1 and are awarded the Prince of Wales Trophy.