Lac Costen is a Lake located in Baie-d'Hudson; Kativik, Quebec.

• Latitude: 56° 3' 44'' North   (decimal: 56.0622222)
• Longitude: 75° 14' 33'' West   (decimal: -75.2425)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-d'Hudson; Kativik
• Atlas of Canada Locator Map: Lac Costen
• GPS Coordinate Locator Map: Lac Costen Lat/Long