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

• Latitude: 51° 8' 34'' North   (decimal: 51.1428293)
• Longitude: 69° 17' 40'' West   (decimal: -69.2944645)
• 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