O'Brien Trophy (ice hockey)

O'Brien Trophy
Award details
Sport	Ice hockey
Given for	1910–17: NHA champion 1921–1927: NHL playoff champion 1927–1938: NHL Canadian Division champion 1939–50: NHL playoff runner-up
History
First award	1910
Most recent	None (Retired trophy)

The O'Brien Trophy, or O'Brien Cup, as labelled on the trophy itself, is a retired trophy that was awarded in the National Hockey Association (NHA) and the National Hockey League (NHL) ice hockey leagues of North America from 1910 to 1950. It was originally donated to the NHA by Canadian Senator M. J. O'Brien in honour of his son, Ambrose O'Brien. The Cup was fabricated using silver from an O'Brien mine.

The Cup has been awarded under four definitions. From 1910 through 1917, it was awarded to the NHA champion. In 1921, the Cup was transferred to the NHL and awarded to the NHL champion until 1927. From 1928 until 1938, it was awarded to the Canadian Division champion. Starting with the 1938–39 season, it was awarded to the NHL playoff runner-up. In 1950, the Cup was retired and has not been awarded since. In total, the Cup has been awarded in 41 seasons to twelve different teams. The Cup is now in the collection of the Hockey Hall of Fame.

The Cup was donated to the National Hockey Association by Canadian Senator Michael J. O'Brien in honour of his son, Ambrose O'Brien, who was credited with the formation of the National Hockey Association, the forerunner to the NHL. The Cup was originally to be given to the NHA's championship team. Made entirely from silver from the O'Brien mine, the trophy's value was estimated at CDN $600 (over CDN $11,355 in 2016 dollars). Like the Stanley Cup, trustees were named for the trophy. These were NHA executives Harry Trihey, Emmett Quinn and T. Yates Foster. Later, Stanley Cup trustee William Foran would become the sole trustee of the O'Brien Cup. On December 2, 1911, the NHA officially designated the trophy as the league's championship trophy.

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