Lac Gagnon is a Lake located in Rivière-aux-Outardes; Manicouagan, Quebec.

• Latitude: 50° 26' 36'' North   (decimal: 50.4433859)
• Longitude: 69° 1' 0'' West   (decimal: -69.0167898)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-aux-Outardes; Manicouagan
• Atlas of Canada Locator Map: Lac Gagnon
• GPS Coordinate Locator Map: Lac Gagnon Lat/Long