Lac du Second is a Lake located in Baie-de-la-Bouteille; Matawinie, Quebec.

• Latitude: 47° 3' 0'' North   (decimal: 47.0500510)
• Longitude: 74° 16' 20'' West   (decimal: -74.2720957)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-de-la-Bouteille; Matawinie
• Atlas of Canada Locator Map: Lac du Second
• GPS Coordinate Locator Map: Lac du Second Lat/Long