Château de Valmont, Medieval castle in Valmont, France

Château de Valmont stands above the Valmont valley and the village, in Seine-Maritime. Its square, buttressed keep dates from the Romanesque period, and the castle was rebuilt in stone and brick in the 15th century. A Renaissance wing known as "François Ier" was added between 1537 and 1554. The building is private property.

Valmont was the cradle of the d'Estouteville family, and its keep dates from the 11th century. Jacques d'Estouteville strengthened and enlarged it under Louis XI, which let it resist the Burgundians of Charles the Bold in 1472. Between 1537 and 1554 Adrienne, duchesse d'Estouteville, and François de Bourbon-Vendôme built the Renaissance wing known as "François Ier".

The château gave its name to the duchy of Valmont, created under Francis I from the old châtellenie. Its rooms keep fireplaces and panelling moved from the older building into the 16th-century wing, and the 15th-century chapel and chartrier in the keep still show where the Estoutevilles kept their archives and held their devotions.

The château is private property and fully protected as a monument historique, so there is no regular public opening. The grounds form a 60.49-hectare classified natural site, and the building stands above the Valmont valley and the village of Valmont. Access is only possible on announced events or organised tours, so check ahead in Valmont.

The keep is the oldest surviving part, a square Romanesque tower with buttresses. In 1472 the castle withstood a siege by the Burgundians of Charles the Bold, after Jacques d'Estouteville had strengthened it under Louis XI. Two-thirds of the building was demolished after 1824 under the comte Hocquart.