The 1945–46 NHL season was the 29th season of the National Hockey League. The Montreal Canadiens won the Stanley Cup, defeating the Boston Bruins for the team's sixth championship.

League business

Synchronized red lights to signal goals were made obligatory for all NHL rinks.

It was rumoured in the press that Lester Patrick planned to retire as general manager of the New York Rangers. On February 22, 1946, he announced his retirement from the general manager position, however he would stay on as vice president of Madison Square Garden.

Regular season

Veterans came back to their teams this year, as World War II ended, but many found they could not regain their form. One who did regain his form was the man formerly known as "Mr. Zero"—Boston Bruins' goaltender Frank Brimsek. He was shelled in an 8–3 contest with Chicago, but got better game by game. The Bruins had first place at one point, then finished second. Brimsek made the Second All-Star Team as a result.

Max Bentley of Chicago led the league in scoring, and, because of the "Pony Line" including him, his brother Doug and Bill Mosienko, the Black Hawks were in first place at one point. But misfortune hit the Hawks when Doug Bentley injured his knee in a January 23 game and the team sagged.