Lac Longtin is a Lake located in Lac-Bazinet; Antoine-Labelle, Quebec.

• Latitude: 47° 0' 39'' North   (decimal: 47.0108771)
• Longitude: 73° 52' 28'' West   (decimal: -73.8743096)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Bazinet; Antoine-Labelle
• Atlas of Canada Locator Map: Lac Longtin
• GPS Coordinate Locator Map: Lac Longtin Lat/Long