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

• Latitude: 48° 41' 51'' North   (decimal: 48.6975)
• Longitude: 70° 42' 19'' West   (decimal: -70.7052778)
• 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 Siffleur
• GPS Coordinate Locator Map: Lac du Siffleur Lat/Long