Lac Caillou is a Lake located in Marsoui; La Haute-Gaspésie, Quebec.

• Latitude: 49° 6' 16'' North   (decimal: 49.1044892)
• Longitude: 65° 59' 39'' West   (decimal: -65.9941104)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Marsoui; La Haute-Gaspésie
• Atlas of Canada Locator Map: Lac Caillou
• GPS Coordinate Locator Map: Lac Caillou Lat/Long