Lac Dupoisson is a Lake located in Rivière-Koksoak; Kativik, Quebec.

• Latitude: 56° 49' 33'' North   (decimal: 56.8256948)
• Longitude: 68° 21' 46'' West   (decimal: -68.3626483)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac Dupoisson
• GPS Coordinate Locator Map: Lac Dupoisson Lat/Long