The Vancouver Millionaires win the 1915 Stanley Cup Finals, the first championship played between the Pacific Coast Hockey Association and the National Hockey Association.

The Vancouver Millionaires were a professional ice hockey team that competed in the Pacific Coast Hockey Association and the Western Canada Hockey League between 1911 and 1926. Based in Vancouver, British Columbia, they played in Denman Arena, the first artificial ice surface in Canada and the largest indoor ice rink in the world at the time it opened.

The 1915 Stanley Cup Final was played from March 22–26, 1915. The Pacific Coast Hockey Association (PCHA) champion Vancouver Millionaires swept the National Hockey Association (NHA) champion Ottawa Senators three games to none in a best-of-five game series. The finals were played in Vancouver, with games one, three and five played under PCHA rules. The Millionaires became the first team from the PCHA to win the Cup. This was the second Stanley Cup championship series between the champions of the NHA and the PCHA and the first held in a PCHA rink.

The Pacific Coast Hockey Association (PCHA) was a professional ice hockey league in Western Canada and the Western United States, which operated from 1911 to 1924 when it then merged with the Western Canada Hockey League (WCHL). The PCHA was considered to be a major league of ice hockey and was important in the development of the sport of professional ice hockey through its innovations.

The National Hockey Association (NHA), initially the National Hockey Association of Canada Limited, was a professional ice hockey organization with teams in Ontario and Quebec, Canada. It is the direct predecessor of today's National Hockey League (NHL), and many of the business processes of the NHL today are based on the NHA. Founded in 1909 by Ambrose O'Brien, the NHA introduced six-man hockey by removing the rover position in 1911. During its lifetime, the league coped with competition for players with the rival Pacific Coast Hockey Association (PCHA), the enlistment of players for World War I and disagreements between owners. The disagreements between owners came to a head in 1917, when the NHA suspended operations in order to get rid of an unwanted owner, Eddie Livingstone.