Lac William is a Lake located in Lac-Ashuapmushuan; Le Domaine-du-Roy, Quebec and has an elevation of 489 meters.

• Latitude: 48° 25' 55'' North   (decimal: 48.4319444)
• Longitude: 72° 54' 23'' West   (decimal: -72.9063889)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 489 meters
• Location: Lac-Ashuapmushuan; Le Domaine-du-Roy
• Atlas of Canada Locator Map: Lac William
• GPS Coordinate Locator Map: Lac William Lat/Long