Lac du Castor is a Lake located in Saint-Zénon; Matawinie, Quebec.

• Latitude: 46° 25' 52'' North   (decimal: 46.4311478)
• Longitude: 73° 39' 40'' West   (decimal: -73.6609736)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Saint-Zénon; Matawinie
• Atlas of Canada Locator Map: Lac du Castor
• GPS Coordinate Locator Map: Lac du Castor Lat/Long