Lac Casgrain is a Lake located in Rivière-Koksoak; Kativik, Quebec.

• Latitude: 55° 55' 27'' North   (decimal: 55.9241667)
• Longitude: 70° 43' 31'' West   (decimal: -70.7252778)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac Casgrain
• GPS Coordinate Locator Map: Lac Casgrain Lat/Long