Lac Duffy is a Lake located in Kiamika; Antoine-Labelle, Quebec and has an elevation of 329 meters.

• Latitude: 46° 17' 50'' North   (decimal: 46.2972744)
• Longitude: 75° 25' 59'' West   (decimal: -75.4329865)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 329 meters
• Location: Kiamika; Antoine-Labelle
• Atlas of Canada Locator Map: Lac Duffy
• GPS Coordinate Locator Map: Lac Duffy Lat/Long