Lac O'Neil is a Lake located in Lac-au-Brochet; La Haute-Côte-Nord, Quebec and has an elevation of 488 meters.

• Latitude: 49° 14' 10'' North   (decimal: 49.2361111)
• Longitude: 69° 27' 50'' West   (decimal: -69.4638889)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 488 meters
• Location: Lac-au-Brochet; La Haute-Côte-Nord
• Atlas of Canada Locator Map: Lac O'Neil
• GPS Coordinate Locator Map: Lac O'Neil Lat/Long