The 1904–05 Manitoba Hockey Association (MHA) season was won by the Rat Portage Thistles.
After the season the Thistles challenged Ottawa for the Stanley Cup, but lost in a three-game series.
Tom Phillips returned to the Thistles after attending McGill University and a year in Toronto.
Phillips brought along goaltender Eddie Giroux, with whom he had played with in the 1903–04 season for the Toronto Marlboros.
[2] After the season, the Thistles challenged the Ottawa Hockey Club in Ottawa In March 1905, the Rat Portage Thistles issued another challenge to the Senators.