Lac Élie-Gagnon is a Lake located in L'Ascension-de-Notre-Seigneur; Lac-Saint-Jean-Est, Quebec.

• Latitude: 48° 43' 18'' North   (decimal: 48.7216667)
• Longitude: 71° 40' 17'' West   (decimal: -71.6713889)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: L'Ascension-de-Notre-Seigneur; Lac-Saint-Jean-Est
• Atlas of Canada Locator Map: Lac Élie-Gagnon
• GPS Coordinate Locator Map: Lac Élie-Gagnon Lat/Long