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

• Latitude: 52° 23' 43'' North   (decimal: 52.3953632)
• Longitude: 73° 31' 43'' West   (decimal: -73.5284830)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Defermont
• GPS Coordinate Locator Map: Lac Defermont Lat/Long