The 1934–35 NHL season was the 18th season of the National Hockey League (NHL). Nine teams each played 48 games. The Montreal Maroons were the Stanley Cup winners as they swept the Toronto Maple Leafs in three games in the Stanley Cup Finals.

Bruins

Black Hawks

Red Wings

Canadiens

Maroons

Americans

Rangers

Eagles

Maple Leafs

Canadian Division American Division

In the midst of the Great Depression financial difficulties continued for the Ottawa Senators. The franchise transferred to St. Louis, changing the nickname to the Eagles. The Ottawa organization continued the Senators as a senior amateur team. Despite the new locale the franchise was not profitable in St. Louis either, due in part high travel expenses resulting from still being in the Canadian Division. The Eagles would sell players Syd Howe and Ralph "Scotty" Bowman to Detroit for $50,000 to make ends meet.

Montreal Canadiens owners Leo Dandurand and Joseph Cattarinich sell the team to Ernest Savard and Maurice Forget of the Canadian Arena Company.

The penalty shot, an invention of the old Pacific Coast Hockey Association (PCHA), was introduced in the NHL this season.^[1] The puck was placed in a 10-foot circle, 38 feet (12 m) from the goalmouth. The player could shoot while stationary within the circle, or could shoot while moving, as long as the shot was taken within the circle.^[1] The goaltender had to be stationary until the puck was shot, and no more than 1 foot (0.30 m) in front of the goal mouth.^[1]

Several more teams changed from a single uniform to a light version and dark version. The Detroit Red Wings introduced a white version of their existing uniform, swapping red elements for white elements. The Chicago Black Hawks introduced a new uniform design, and differentiated between versions by using white in the main horizontal stripe and their socks, and using brown in the other version. The New York Americans and Toronto Maple Leafs continued using their two sets of uniforms. The Boston Bruins, Montreal Canadiens, Montreal Maroons, New York Rangers and St. Louis Eagles used only a single uniform design each.^[2]

Charlie Conacher decided to play coy this year and Conn Smythe had trouble signing him. With Harvey Jackson out, it looked as though Joe Primeau would be the only member of the Kid line in action for Toronto. However, he did finally sign. Conacher responded with his best season, scoring 36 goals and leading the league in scoring.

A bombshell trade was made with Howie Morenz, Lorne Chabot and Marty Burke going to Chicago for Leroy Goldsworthy, Roger Jenkins, and Lionel Conacher. Although Morenz was not his old self, he did help Chicago, who finished second in the American Division, just falling short of Boston by only one point. The Canadiens then traded Lionel Conacher and Herb Cain to the Maroons for Nels Crutchfield. The trades did not help and the Canadiens lost some fans.

Meanwhile, Tommy Gorman bought a share of the Montreal Maroons from James Strachan and when he picked up Alex Connell, he had another winner.

The first penalty shot was awarded to the Montreal Canadiens' Armand Mondou on November 10, 1934; he was stopped by the Toronto Maple Leafs' George Hainsworth. On November 13, Ralph "Scotty" Bowman of the St. Louis Eagles scored the first penalty shot goal in NHL history.

The playoffs continued to elude the New York Americans, but they added two important additions, left wing Dave "Sweeney" Schriner and right wing Lorne Carr. Teamed with centre Art Chapman, the Americans were on the way up.

Eddie Shore won the Hart Trophy for the second time in his career. Frank Boucher won the Lady Byng for the seventh and final time in his career, and his third consecutive time. Lorne Chabot won the Vezina for the first and only time in his career.

The following is a list of players of note who played their first NHL game in 1934–35 (listed with their first team, asterisk(*) marks debut in playoffs):

• Tommy Anderson, Detroit Red Wings
• Bucko McDonald, Detroit Red Wings
• Sweeney Schriner, New York Americans
• Lynn Patrick, New York Rangers
• Toe Blake, Montreal Maroons
• Bill Cowley, St. Louis Eagles
• Art Jackson, Toronto Maple Leafs
• Bob Davidson, Toronto Maple Leafs
• Nick Metz, Toronto Maple Leafs

The following is a list of players of note that played their last game in the NHL in 1934–35 (listed with their last team):

• John Ross Roach, Detroit Red Wings
• Albert Leduc, Montreal Canadiens
• Norman Gainor, Montreal Maroons
• Alex Smith, New York Americans
• Charley McVeigh, New York Americans
• Normie Himes, New York Americans

• 1934–35 NHL transactions
• List of Stanley Cup champions
• 1934 in sports
• 1935 in sports