Lac Saint-Onge is a Lake located in Lac-au-Brochet; La Haute-Côte-Nord, Quebec and has an elevation of 456 meters.

• Latitude: 48° 39' 34'' North   (decimal: 48.6594444)
• Longitude: 69° 42' 22'' West   (decimal: -69.7061111)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 456 meters
• Location: Lac-au-Brochet; La Haute-Côte-Nord
• Atlas of Canada Locator Map: Lac Saint-Onge
• GPS Coordinate Locator Map: Lac Saint-Onge Lat/Long