The château du Saussay is a French château that forms part of the commune of Ballancourt-sur-Essonne in the department of Essonne. It is situated in the valley of the river Essonne between Corbeil and La Ferté-Alais, on the territory of an old Templar commandery. It is built on the ruins of a 15th-century feudal castle, and is a rare collection of two 18th-century châteaux facing each other at the entrance to a Romantic park surrounded by water.