Château de la Seilleraye, 17th-century historical monument in Carquefou, France

Château de la Seilleraye is a 17th-century estate featuring symmetrical wings, classical proportions, and a central stone pavilion. The structure displays balanced architecture with a formal layout that reflects the design principles of its era.

The present château was built in 1671 for Guillaume d'Harouys, treasurer of the Estates of Brittany, to designs by the Parisian architect Delahaye. Madame de Sévigné stopped there on 24 September 1675 and wrote to her daughter about the difficulties of its construction. The marquis de Becdelièvre completed the building after 1730, and in 1828 it passed by marriage to the de Courtarvel family.

The château belonged to the Harouys family, which gave Nantes several mayors, before passing by marriage to the Becdelièvre family. Madame de Sévigné, a relative of the family, stopped here on 24 September 1675 and wrote to Madame de Grignan about the difficulties of its construction. The name comes from the seigneurie de la Seilleraye, not from a stream.

The property has been converted into private residences, allowing visitors to view the exterior and grounds. Since interiors are not publicly accessible, a visit is best appreciated for observing the outer architecture and landscape design.

The 18th-century panelling in the interior long concealed large ornamental paintings from the 17th century, which were rediscovered in the 1990s. These complement figurative decorations that had been known for years in the chapel and the vestibule. The château was bought second-hand by Nantes businessman André Jallais before the German occupation.