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

• Latitude: 52° 31' 55'' North   (decimal: 52.5319444)
• Longitude: 74° 45' 19'' West   (decimal: -74.7552778)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Baie-James; Jamésie
• Atlas of Canada Locator Map: Lac Tréfart
• GPS Coordinate Locator Map: Lac Tréfart Lat/Long