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

• Latitude: 50° 24' 42'' North   (decimal: 50.4116667)
• Longitude: 70° 11' 56'' West   (decimal: -70.1988889)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Mont-Valin; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac Antonio
• GPS Coordinate Locator Map: Lac Antonio Lat/Long