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

• Latitude: 56° 18' 9'' North   (decimal: 56.3025)
• Longitude: 66° 35' 21'' West   (decimal: -66.5891667)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Koksoak; Kativik
• Atlas of Canada Locator Map: Lac Testu
• GPS Coordinate Locator Map: Lac Testu Lat/Long