Lac Gagnon is a Lake located in Baie-James; Jamésie, Quebec and has an elevation of 284 meters.

• Latitude: 49° 43' 48'' North   (decimal: 49.7300000)
• Longitude: 79° 19' 17'' West   (decimal: -79.3213888)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 284 meters
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Gagnon
• GPS Coordinate Locator Map: Lac Gagnon Lat/Long