The lac Jacques-Cartier, main source of the Jacques-Cartier River, is a glacial lake located in the Laurentides Wildlife Reserve, about 90 km to the north of the city of Quebec, in the unorganized territory of Lac-Jacques-Cartier, in the La Côte-de-Beaupré Regional County Municipality, in the administrative region of Capitale-Nationale, in the province of Quebec, in Canada.