Lac Big Trout is a Lake located in Lac-Nilgaut; Pontiac, Quebec.

• Latitude: 46° 20' 23'' North   (decimal: 46.3397815)
• Longitude: 77° 36' 1'' West   (decimal: -77.6003020)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Nilgaut; Pontiac
• GPS Coordinate Locator Map: Lac Big Trout Lat/Long