Lac Mathieu is a Lake located in Rivière-Mistassini; Maria-Chapdelaine, Quebec and has an elevation of 207 meters.

• Latitude: 49° 10' 47'' North   (decimal: 49.1797222)
• Longitude: 72° 13' 32'' West   (decimal: -72.2255556)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 207 meters
• Location: Rivière-Mistassini; Maria-Chapdelaine
• Atlas of Canada Locator Map: Lac Mathieu
• GPS Coordinate Locator Map: Lac Mathieu Lat/Long