Château de Creil, Medieval castle in Creil, France.

Château de Creil is a former fortified castle and royal residence on the island of Saint-Maurice in Creil. Of its medieval extent, about a quarter survives: a pale stone facade with three narrow round-headed windows and two arched doorways, and a cylindrical tower with a crenellated parapet on corbels. The northeast tower and an adjacent 1788 building now house the Musée Gallé-Juillet.

This fortress developed during the medieval period as a strategic stronghold along the Oise river. In 1441, the English garrison surrendered after French artillery forces under King Charles VII attacked and breached its defenses.

Marguerite de Navarre had the castle rebuilt around 1540 to a design by Jacques I Androuet du Cerceau, and it was then listed among 'les plus excellent bâtiments de France'. A contemporary description calls it 'd'assez grand monstre, mais un peu obscur par dedans' — quite large, but a little dark inside.

The surviving northeast tower and the 1788 adjoining house now form the Musée Gallé-Juillet, so the castle is seen from the museum side rather than as a separate ruin. The tower was restored in 2018. The site stands in central Creil, near the Oise and the Saint-Maurice island crossing the castle once guarded.

The northeast tower, restored in 2018, has housed the Musée Gallé-Juillet since 1930 together with an adjacent house of 1788. The museum preserves the collections of the Gallé-Juillet family, and the tower is the only standing remnant of the medieval castle.