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

• Latitude: 53° 7' 59'' North   (decimal: 53.1330556)
• Longitude: 70° 42' 19'' West   (decimal: -70.7052778)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• GPS Coordinate Locator Map: Lac Back Lat/Long