Lac Constantin is a Lake located in Lac-Blanc; Portneuf, Quebec.

• Latitude: 47° 22' 31'' North   (decimal: 47.3752778)
• Longitude: 72° 3' 31'' West   (decimal: -72.0586111)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Blanc; Portneuf
• GPS Coordinate Locator Map: Lac Constantin Lat/Long