Lac O'Brien is a Lake located in Lac-Jacques-Cartier; La Côte-de-Beaupré, Quebec and has an elevation of 802 meters.

• Latitude: 47° 19' 2'' North   (decimal: 47.3172222)
• Longitude: 71° 13' 19'' West   (decimal: -71.2219444)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 802 meters
• Location: Lac-Jacques-Cartier; La Côte-de-Beaupré
• Atlas of Canada Locator Map: Lac O'Brien
• GPS Coordinate Locator Map: Lac O'Brien Lat/Long