Lake O'Hara is a lake at an elevation of 2,115 m in the alpine area of Yoho National Park, in the province of British Columbia, on the western side of the Great Divide with the province of Alberta and Banff National Park to the east. The lake and the valley are accessible through a bus service that is run by Parks Canada or by an 11 km hike along a road with an elevation gain of approximately 500m. Reservations for the bus can be made up to three months in advance through the Lake O'Hara reservation line.