Lac Allen is a Lake located in Rivière-Éternité; Le Fjord-du-Saguenay, Quebec.

• Latitude: 48° 10' 21'' North   (decimal: 48.1725)
• Longitude: 70° 32' 49'' West   (decimal: -70.5469444)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Éternité; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac Allen
• GPS Coordinate Locator Map: Lac Allen Lat/Long