The National Hockey League (NHL; French: Ligue nationale de hockey [liɡ nɑsjɔnal də ɔkɛ], LNH) 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 league's headquarters have been in New York City since 1989, when it moved from Montreal; the league also has offices in Toronto and Montreal.
The NHL was organized at the Windsor Hotel in Montreal on November 26, 1917, after the suspension of operations of its predecessor organization, the National Hockey Association (NHA), which had been founded in 1909 at Renfrew, Ontario. The NHL immediately took the NHA's place as one of the leagues that contested for the Stanley Cup in an annual interleague competition, before a series of league mergers and foldings left the NHL as the only league competing for the Stanley Cup in 1926.
At its inception, the NHL had four teams, all in Canada, thus the adjective "National" in the league's name. The league expanded to the United States in 1924, when the Boston Bruins joined, and has since consisted of both American and Canadian teams. From 1942 to 1967, the NHL had only six teams, collectively nicknamed the "Original Six". The league added six new teams to double its size as a result of the 1967 NHL expansion, then increased to 18 teams by 1974, and to 21 teams due to the 1979 NHL expansion. Between 1991 and 2000, the NHL further expanded to 30 teams. It added its 31st and 32nd teams in 2017 and 2021. Salt Lake City was awarded an expansion franchise in 2024; it acquired the hockey assets of the Arizona Coyotes, which were deactivated, and established the Utah Hockey Club (now the Utah Mammoth), thus maintaining the total number of teams at 32.
The NHL is the fifth-highest grossing professional sports league in the world by revenue. There have been four league-wide work stoppages in NHL history, all occurring since 1992. As of the 2024–25 season, the NHL had players from 18 countries.
The league's regular season is typically held from October to April, with each team playing 82 games. Following the conclusion of the regular season, 16 teams advance to the Stanley Cup playoffs, a four-round tournament that runs into June to determine the league champion. Since the league's founding in 1917, the Montreal Canadiens have won the most NHL titles with 25, winning three NHL championship series before the league took full exclusivity of the Stanley Cup in 1926, and 22 Stanley Cups afterwards. The reigning league champions are the Carolina Hurricanes, who defeated the Vegas Golden Knights in the 2026 Stanley Cup Final.
The National Hockey League (NHL) was established in 1917 as the successor to the National Hockey Association (NHA). Founded in 1909, the NHA began play in 1910 with seven teams in Ontario and Quebec, and was one of the first major leagues in professional ice hockey. However, by its eighth season, a series of disputes with Toronto Blueshirts owner Eddie Livingstone led team owners of the Montreal Canadiens, the Montreal Wanderers, the Ottawa Senators, and the Quebec Bulldogs to hold a meeting to discuss the league's future. Realizing the NHA constitution left them unable to force Livingstone out, the four teams voted instead to suspend the NHA, and, on November 26, 1917, formed the National Hockey League. Frank Calder was chosen as the NHL's first president, serving until his death in 1943.
The Bulldogs were unable to play in the NHL, and the remaining owners founded the Toronto Arenas to compete with the Canadiens, Wanderers and Senators. The first games were played on December 19, 1917. The Montreal Arena burned down in January 1918, causing the Wanderers to cease operations, and the NHL continued on as a three-team league until the Bulldogs returned in 1919.
The NHL replaced the NHA as one of the leagues that competed for the Stanley Cup, an interleague competition at the time. Toronto won the first NHL title, and then defeated the Vancouver Millionaires of the Pacific Coast Hockey Association (PCHA) for the 1918 Stanley Cup. The Canadiens won the league title in 1919, but the series in the Stanley Cup Final against the PCHA's Seattle Metropolitans was abandoned due to the Spanish Flu epidemic. In 1924, Montreal won their first Stanley Cup as a member of the NHL. The Hamilton Tigers won the regular season title in 1924–25, but refused to play in the championship series unless they were given a C$200 bonus. The league refused and declared the Canadiens the league champion after they defeated the Toronto St. Patricks (formerly the Arenas) in the two-game, total-goals NHL championship series. Montreal was then defeated by the Victoria Cougars of the Western Canada Hockey League (WCHL) in 1925. It was the last time a non-NHL team won the trophy, as the Stanley Cup became the de facto NHL championship in 1926, after the WCHL ceased operation.
The NHL embarked on a rapid expansion in the 1920s, adding the Montreal Maroons and the Boston Bruins in 1924, the latter being the first American team to join the league. The New York Americans began play in 1925 after purchasing the assets of the Hamilton Tigers, and they were joined by the Pittsburgh Pirates. The New York Rangers were added in 1926, and the Chicago Black Hawks (later changed to Blackhawks) and Detroit Cougars (later known as the Red Wings) were added after the league purchased the assets of the defunct WCHL. A group purchased the Toronto St. Patricks in 1927 and renamed them the Toronto Maple Leafs.
In 1926, Native American Taffy Abel became the first non-white player in the NHL and broke the league's colour barrier by playing for the New York Rangers.
In 1934, the first NHL All-Star Game was held, to benefit Ace Bailey, whose career ended on a vicious hit by Eddie Shore. The second was held in 1937, in support of Howie Morenz's family when he died of a coronary embolism after breaking his leg during a game.
The Great Depression and the onset of World War II took a toll on the league. The Pirates became the Philadelphia Quakers in 1930, then folded a year later. The Senators likewise became the St. Louis Eagles in 1934, also lasting only a year. The Maroons did not survive, as they suspended operations in 1938. The Americans were suspended in 1942 due to a lack of available players, and they were never reactivated.
For the 1942–43 season, the NHL was reduced to six teams: the Boston Bruins, the Chicago Black Hawks, the Detroit Red Wings, the Montreal Canadiens, the New York Rangers, and the Toronto Maple Leafs, a line-up, often referred to as the "Original Six", that would remain constant for the next 25 years. In 1947, the league reached an agreement with the Stanley Cup trustees to take full control of the trophy, allowing it to reject challenges from other leagues that wished to play for the Cup.
In 1945, Maurice "Rocket" Richard became the first player to score 50 goals, doing so in a 50-game season. Richard later led the Canadiens to five consecutive titles between 1956 and 1960, a record no team has matched.
In 1948, Asian Canadian Larry Kwong became the first Asian player in the NHL by playing for the New York Rangers. In 1958, Willie O'Ree became the first black player in the league's history when he made his debut with the Boston Bruins.
By the mid-1960s, the desire for a network television contract in the United States, coupled with concerns that the Western Hockey League was planning to declare itself a major league and challenge for the Stanley Cup, spurred the NHL to undertake its first expansion since the 1920s. The league doubled in size to 12 teams for the 1967–68 season, adding the Los Angeles Kings, the Minnesota North Stars, the Philadelphia Flyers, the Pittsburgh Penguins, the California Seals, and the St. Louis Blues. However, Canadian fans were outraged that all six teams were placed in the United States, so the league responded by adding the Vancouver Canucks in 1970, along with the Buffalo Sabres, both located along the Canada–United States border. Two years later, the emergence of the newly founded World Hockey Association (WHA) led the league to add the New York Islanders and the Atlanta Flames to keep the rival league out of those markets. In 1974, the Washington Capitals and the Kansas City Scouts were added, bringing the league up to 18 teams.