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

• Latitude: 49° 43' 2'' North   (decimal: 49.7173083)
• Longitude: 79° 30' 45'' West   (decimal: -79.5125826)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• GPS Coordinate Locator Map: Lac Numéro Un Lat/Long