Lac Martineau is a Lake located in Lac-Jacques-Cartier; La Côte-de-Beaupré, Quebec.

• Latitude: 47° 25' 33'' North   (decimal: 47.4258333)
• Longitude: 71° 30' 52'' West   (decimal: -71.5144444)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Lac-Jacques-Cartier; La Côte-de-Beaupré
• Atlas of Canada Locator Map: Lac Martineau
• GPS Coordinate Locator Map: Lac Martineau Lat/Long