Commonwealth Mountain is a mountain on Ellesmere Island, Nunavut, Canada. It lies in western Quttinirpaaq National Park, which is the most northerly extent of Canada, and is the second most northerly park on Earth after Northeast Greenland National Park.

With a height of 2,225 m (7,300 ft), it is highest point of the Challenger Mountains which in turn form part of the Arctic Cordillera mountain range.