Lac O'Brien is a Lake located in Bristol; Pontiac, Quebec and has an elevation of 174 meters.

• Latitude: 45° 36' 2'' North   (decimal: 45.6005556)
• Longitude: 76° 18' 47'' West   (decimal: -76.3130556)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 174 meters
• Location: Bristol; Pontiac
• Atlas of Canada Locator Map: Lac O'Brien
• GPS Coordinate Locator Map: Lac O'Brien Lat/Long