Lac Grandfontaine is a Lake located in Baie-James; Jamésie, Quebec.

• Latitude: 53° 12' 38'' North   (decimal: 53.2105556)
• Longitude: 70° 34' 31'' West   (decimal: -70.5752778)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Grandfontaine
• GPS Coordinate Locator Map: Lac Grandfontaine Lat/Long