Lac Martha is a Lake located in Lac-De La Bidière; Antoine-Labelle, Quebec.

• Latitude: 47° 7' 21'' North   (decimal: 47.1225)
• Longitude: 74° 34' 42'' West   (decimal: -74.5783333)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-De La Bidière; Antoine-Labelle
• Atlas of Canada Locator Map: Lac Martha
• GPS Coordinate Locator Map: Lac Martha Lat/Long