Lac du Commis is a Lake located in Mont-Valin; Le Fjord-du-Saguenay, Quebec.

• Latitude: 48° 59' 10'' North   (decimal: 48.9861512)
• Longitude: 70° 45' 48'' West   (decimal: -70.7634067)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Mont-Valin; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac du Commis
• GPS Coordinate Locator Map: Lac du Commis Lat/Long