The Château d'Eu (French pronunciation: [ʃato dø]) is a former royal residence in the town of Eu, in the Seine-Maritime department of France, in Normandy.
The Château d'Eu stands at the centre of the town and was built in the 16th century to replace an earlier one purposely demolished in 1475 to prevent its capture by the English.
The chapel contains the tombs of Henry I, Duke of Guise, and his wife, Catherine de Clèves, who embarked on the construction of the château in 1578.
Between 1830 and 1848, the château, which had been the property of the House of Orléans since its acquisition by La Grande Mademoiselle in October 1657, served as King Louis-Philippe I's summer residence.
Their eldest son, Pedro de Alcântara, Prince of Grão-Pará, sold the château to the Brazilian entrepreneur Assis Chateaubriand.