Lac Derby is a Lake located in Rivière-Mouchalagane; Caniapiscau, Quebec and has an elevation of 637 meters.

• Latitude: 52° 38' 48'' North   (decimal: 52.6466666)
• Longitude: 67° 45' 51'' West   (decimal: -67.7641667)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 637 meters
• Location: Rivière-Mouchalagane; Caniapiscau
• Atlas of Canada Locator Map: Lac Derby
• GPS Coordinate Locator Map: Lac Derby Lat/Long