Lac Lyonnais is a Lake located in Bouchette; La Vallée-de-la-Gatineau, Quebec.

• Latitude: 46° 10' 17'' North   (decimal: 46.1713889)
• Longitude: 75° 54' 15'' West   (decimal: -75.9041667)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Bouchette; La Vallée-de-la-Gatineau
• GPS Coordinate Locator Map: Lac Lyonnais Lat/Long