Lac Gagnon is a Lake located in Waltham; Pontiac, Quebec and has an elevation of 246 meters.

• Latitude: 45° 58' 19'' North   (decimal: 45.9719444)
• Longitude: 76° 55' 15'' West   (decimal: -76.9208333)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 246 meters
• Location: Waltham; Pontiac
• Atlas of Canada Locator Map: Lac Gagnon
• GPS Coordinate Locator Map: Lac Gagnon Lat/Long