Lac Gagnon is a Lake located in Sainte-Jeanne-d'Arc; La Mitis, Quebec.

• Latitude: 48° 30' 34'' North   (decimal: 48.5094444)
• Longitude: 67° 56' 00'' West   (decimal: -67.9333333)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Sainte-Jeanne-d'Arc; La Mitis
• Atlas of Canada Locator Map: Lac Gagnon
• GPS Coordinate Locator Map: Lac Gagnon Lat/Long