The 1891 Amateur Hockey Association of Canada season saw the Montreal Hockey Club win the league and Canadian championship for the fourth straight season. Ontario launched the Ontario Hockey Association (OHA) as the popularity of the sport spread west. Ottawa, the eventual Ontario champion, played in a challenge with Montreal and lost. The Dominion Hockey Club did not return to put on a challenge. The Shamrock Athletic Association mounted their first challenge. The Ottawa Hockey Club returned to AHAC play.