Rocher Lacaille is a Island located in Saint-Antoine-de-l'Isle-aux-Grues; Montmagny, Quebec.

• Latitude: 47° 7' 20'' North   (decimal: 47.1222445)
• Longitude: 70° 31' 19'' West   (decimal: -70.5220223)
• Topography Feature Category: Island
• Geographical Feature: Rocher
• Canadian Province/Territory: Quebec
• Location: Saint-Antoine-de-l'Isle-aux-Grues; Montmagny
• Atlas of Canada Locator Map: Rocher Lacaille
• GPS Coordinate Locator Map: Rocher Lacaille Lat/Long