The Blue Mountains is a town in Grey County, southwestern Ontario, Canada, located where the Beaver River flows into Nottawasaga Bay. It is named for the Blue Mountain, and hence the economy of the town is centred on tourism, particularly on the Blue Mountain ski resort and the private Craigleith and Alpine Ski Clubs.
The town was formed on January 1, 2001, when the Town of Thornbury and the remaining settlements in the Township of Collingwood were amalgamated. Thornbury is home to the architecturally unique L.E. Shore Memorial Library, named after the founding partner of the architectural practice of Shore Tilbe Irwin + Partners, and designed by the firm.
The Bruce Trail passes through sections of the town. The Kolapore area for mountain biking and cross-country skiing, Metcalfe Rock which is popular with rock climbers as well as the Duncan Crevice Caves Nature Reserve are in the area as well.
The primary population centre is Thornbury. Additionally the town's territory also includes the communities of Banks, Camperdown, Castle Glen Estates, Christie Beach, Clarksburg, Craigleith, Duncan, Gibraltar, Heathcote, Kolapore, Little Germany, Lora Bay, Loree, Ravenna, Red Wing, Slabtown, and Victoria Corners.