Lac Marteau is a Lake located in Havre-Saint-Pierre; Minganie, Quebec.

• Latitude: 50° 26' 23'' North   (decimal: 50.4397222)
• Longitude: 63° 29' 52'' West   (decimal: -63.4977778)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Havre-Saint-Pierre; Minganie
• Atlas of Canada Locator Map: Lac Marteau
• GPS Coordinate Locator Map: Lac Marteau Lat/Long