Lac Gillis is a Lake located in Lac-Nilgaut; Pontiac, Quebec and has an elevation of 303 meters.

• Latitude: 46° 17' 52'' North   (decimal: 46.2977778)
• Longitude: 76° 33' 29'' West   (decimal: -76.5580555)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 303 meters
• Location: Lac-Nilgaut; Pontiac
• Atlas of Canada Locator Map: Lac Gillis
• GPS Coordinate Locator Map: Lac Gillis Lat/Long