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

• Latitude: 48° 18' 15'' North   (decimal: 48.3041952)
• Longitude: 70° 22' 36'' West   (decimal: -70.3767340)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Éternité; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac John
• GPS Coordinate Locator Map: Lac John Lat/Long