Lac Ludger is a Lake located in Mont-Valin; Le Fjord-du-Saguenay, Quebec.

• Latitude: 49° 9' 13'' North   (decimal: 49.1536111)
• Longitude: 70° 54' 34'' West   (decimal: -70.9094444)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Mont-Valin; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac Ludger
• GPS Coordinate Locator Map: Lac Ludger Lat/Long