Lac Jean-Guy is a Lake located in Rivière-Mistassini; Maria-Chapdelaine, Quebec.

• Latitude: 49° 58' 15'' North   (decimal: 49.9708988)
• Longitude: 72° 13' 38'' West   (decimal: -72.2273141)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Mistassini; Maria-Chapdelaine
• Atlas of Canada Locator Map: Lac Jean-Guy
• GPS Coordinate Locator Map: Lac Jean-Guy Lat/Long