Lac Old Mill is a Lake located in Waltham; Pontiac, Quebec and has an elevation of 119 meters.

• Latitude: 45° 54' 34'' North   (decimal: 45.9094444)
• Longitude: 76° 54' 53'' West   (decimal: -76.9147222)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 119 meters
• Location: Waltham; Pontiac
• Atlas of Canada Locator Map: Lac Old Mill
• GPS Coordinate Locator Map: Lac Old Mill Lat/Long