The 1918 Allan Cup was the Canadian senior ice hockey championship for the 1917–18 season.
The Toronto Dentals were challenged by the Kitchener Greenshirts, for the OHA Senior championship.
The Kitchener Greenshirts received a challenge from the Port Arthur Columbus Club, Thunder Bay senior champions.
Kitchener Greenshirts received a challenge from the Winnipeg Ypres, Western Canada Senior champions.
With no more challengers accepted in time to play, the Greenshirts win the 1918 Allan Cup.