Which team won the 1915 Stanley Cup as the first PCHA champion to take the trophy?

The Vancouver Millionaires won the 1915 Stanley Cup as the first PCHA champion to capture the trophy. They defeated the Ottawa Senators three games to none in a best-of-five series.

The Millionaires were the champions of the Pacific Coast Hockey Association, a rival professional league founded in 1911. Their victory marked the first time a PCHA team won the Stanley Cup and made Vancouver the first western Canadian city to celebrate a championship. The series was played in Vancouver, and the Millionaires outscored Ottawa 17–8 across the three games.

This result belongs to the early, pre-NHL era of the Stanley Cup, when champions from different leagues met in challenge or championship series. Victoria Cougars later became the first PCHA team to win the Cup after the league’s 1914–15 season, while the Seattle Metropolitans became the first American-based winner in 1917. The Ottawa Senators were a major early power, but they lost this particular series.