Lac à Madame-Vaillancourt is a Lake located in Forestville; La Haute-Côte-Nord, Quebec.

• Latitude: 48° 43' 55'' North   (decimal: 48.7319742)
• Longitude: 69° 7' 25'' West   (decimal: -69.1236612)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Forestville; La Haute-Côte-Nord
• Atlas of Canada Locator Map: Lac à Madame-Vaillancourt
• GPS Coordinate Locator Map: Lac à Madame-Vaillancourt Lat/Long