The Aigremont Lake is a freshwater body flowing out of the Little Chief River, flowing into the unorganized territory of Lac-Ashuapmushuan, Quebec, in the northwestern part of the Regional County Municipality (RCM) Le Domaine-du-Roy, in the Saguenay-Lac-Saint-Jean administrative region, in the province of Quebec, in Canada.

The route 167 linking Chibougamau to Saint-Félicien, Quebec passes on the south shore of the lake.

Farther south, the Canadian National Railway runs along the Normandin River, and approaches route 167 as it winds up to the northwest to Chibougamau.

The surface of Lake Aigremont is usually frozen from early November to mid-May, however safe ice circulation is generally from mid-November to mid-April.

Formalized in 1925 by the Quebec Geography Commission, this hydronym evokes the work of life of François Clairambault d'Aigremont (1659-1728), acting intendant of Nouvelle-France.