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

• Latitude: 46° 16' 50'' North   (decimal: 46.2806145)
• Longitude: 77° 14' 50'' West   (decimal: -77.2472330)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Nilgaut; Pontiac
• Atlas of Canada Locator Map: Lac Gratton
• GPS Coordinate Locator Map: Lac Gratton Lat/Long