Lac des Grises is a Lake located in Rivière-Mistassini; Maria-Chapdelaine, Quebec.

• Latitude: 49° 23' 20'' North   (decimal: 49.3889353)
• Longitude: 72° 17' 23'' West   (decimal: -72.2897639)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Mistassini; Maria-Chapdelaine
• Atlas of Canada Locator Map: Lac des Grises
• GPS Coordinate Locator Map: Lac des Grises Lat/Long