Coordinates: 45°24′55″N 75°43′45″W / 45.41523°N 75.72919°W
Lemieux Island (French: Île Lemieux) is a small island in the middle of the Ottawa River in the National Capital Region of Canada. The island lies between Gatineau, Quebec and the national capital, Ottawa, Ontario. Administratively being a part of the latter, it is crossed by the Prince of Wales Bridge and serves a site for the water filtration plant.