Lac du Roi is a Lake located in Rivière-Mistassini; Maria-Chapdelaine, Quebec.

• Latitude: 49° 10' 39'' North   (decimal: 49.1775105)
• Longitude: 72° 11' 50'' West   (decimal: -72.1971833)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Rivière-Mistassini; Maria-Chapdelaine
• Atlas of Canada Locator Map: Lac du Roi
• GPS Coordinate Locator Map: Lac du Roi Lat/Long