Lac Montgrain is a Lake located in La Tuque; Le Haut-Saint-Maurice, Quebec.

• Latitude: 47° 46' 8'' North   (decimal: 47.7689625)
• Longitude: 75° 25' 57'' West   (decimal: -75.4323916)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: La Tuque; Le Haut-Saint-Maurice
• Atlas of Canada Locator Map: Lac Montgrain
• GPS Coordinate Locator Map: Lac Montgrain Lat/Long