Lac William is a Lake located in Lac-Blanc; Portneuf, Quebec and has an elevation of 531 meters.

• Latitude: 47° 13' 7'' North   (decimal: 47.2186111)
• Longitude: 71° 56' 2'' West   (decimal: -71.9338889)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 531 meters
• Location: Lac-Blanc; Portneuf
• Atlas of Canada Locator Map: Lac William
• GPS Coordinate Locator Map: Lac William Lat/Long