Buade Lake is a freshwater body of the unorganized territory of Lac-Ashuapmushuan, Quebec, in the western part of the Regional County Municipality (MRC) Le Domaine-du-Roy, in the administrative region of Saguenay-Lac-Saint-Jean, in the province of Quebec, in Canada .

The western portion of the Buade Lake hydrographic slope is accessible via the R1032 forest road (North-South direction) which passes through the Ventadour River valley, on the west side.

The forest road route 167 passes northeast of Nicabau Lake, connecting Chibougamau to Saint-Félicien, Quebec; a secondary road is detached to serve the east side of Poutrincourt Lake.

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

The toponym "Lake Buade" was made official on December 5, 1968, by the Commission de toponymie du Québec.