Lac du Castor is a Lake located in Montpellier; Papineau, Quebec.

• Latitude: 45° 53' 47'' North   (decimal: 45.8964000)
• Longitude: 75° 12' 25'' West   (decimal: -75.2068999)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Montpellier; Papineau
• GPS Coordinate Locator Map: Lac du Castor Lat/Long