The Mann Cup is the trophy awarded to the senior men's lacrosse champions of Canada. It was donated in 1901 by Sir Donald Mann. It was originally a challenge trophy, but in 1925 the champion New Westminster Salmonbellies turned the trophy over to the Canadian Lacrosse Association who instituted a national playoff system. The Minto Cup also was awarded as a national senior championship trophy from 1901 to 1934, but in 1937 it became the trophy for the national junior championship. Since 1935 the Mann Cup competition has been played under box lacrosse rules.