Lac Dumanoir is a Lake located in Baie-James; Jamésie, Quebec.

• Latitude: 52° 11' 14'' North   (decimal: 52.1873035)
• Longitude: 74° 3' 34'' West   (decimal: -74.0593409)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Dumanoir
• GPS Coordinate Locator Map: Lac Dumanoir Lat/Long