Lac du Castor is a Lake located in Rivière-aux-Outardes; Manicouagan, Quebec.

• Latitude: 49° 51' 36'' North   (decimal: 49.86)
• Longitude: 68° 40' 22'' West   (decimal: -68.6727778)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-aux-Outardes; Manicouagan
• Atlas of Canada Locator Map: Lac du Castor
• GPS Coordinate Locator Map: Lac du Castor Lat/Long