The 1906 ECAHA season was the inaugural season of the Eastern Canada Amateur Hockey Association (ECAHA). Six teams played a 10-game schedule. The Ottawa HC and Montreal Wanderers tied for the league championship with a record of 9–1, while the Montreal Shamrocks didn't win a single game. The Senators and the Wanderers then played a two-game playoff for the league championship and the Stanley Cup, and the Wanderers won 9–1,3–9 (12–10) on goals.