Lac Desmars is a Lake located in Baie-James; Jamésie, Quebec.

• Latitude: 52° 57' 50'' North   (decimal: 52.9638889)
• Longitude: 70° 2' 37'' West   (decimal: -70.0436111)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Desmars
• GPS Coordinate Locator Map: Lac Desmars Lat/Long