Lac à Petit-Jean is a Lake located in Saint-Théophile; Beauce-Sartigan, Quebec.

• Latitude: 45° 54' 30'' North   (decimal: 45.9083719)
• Longitude: 70° 16' 8'' West   (decimal: -70.2689533)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Location: Saint-Théophile; Beauce-Sartigan
• Atlas of Canada Locator Map: Lac à Petit-Jean
• GPS Coordinate Locator Map: Lac à Petit-Jean Lat/Long