The National Hockey League cancels the entire 2004–05 regular season and playoffs.

The National Hockey League is a professional ice hockey league in North America composed of 32 teams, 25 in the United States and 7 in Canada. The NHL is one of the major professional sports leagues in the United States and Canada and is considered the premier professional ice hockey league in the world. The Stanley Cup, the oldest professional sports trophy in North America, is awarded annually to the league playoff champion at the end of each season. The International Ice Hockey Federation (IIHF) views the Stanley Cup as one of the "most important championships available to the sport". The NHL is headquartered in Midtown Manhattan.

The 2004–05 NHL lockout was a labor lockout that resulted in the cancellation of the National Hockey League (NHL) season, which would have been its 88th season of play.