These events occured in 1921 in the world of ice hockey:
- Ottawa Senators defeats Toronto St. Patricks to win the NHL championship.
- Vancouver Millionaires defeats Seattle Metropolitans in a two–game total–goal series 1–3, 6–0 (7–3) to win the PCHA championship.
- 30 January – IFK Uppsala defeats Berliner SC, 4–1, in front of 2 022 spectators at the Stockholm Stadium when the first ever ice hockey game in Sweden is played.
21 March – 4 April — Ottawa Senators defeats Vancouver Millionares in the 1921 Stanley Cup Finals by 3 games to 2
- Swedish Ice Hockey Year by Year (English). Swedish Ice Hockey Association. Retrieved on 2 May 2021.