Le Rœulx Castle, Medieval castle residence in Le Rœulx, Belgium.

Le Rœulx Castle is a château in the town of Le Rœulx, in the Belgian province of Hainaut, with a classical main facade and large wings built during the 18th century. The building sits within a park and combines a medieval core with later additions that give it its current form.

The castle's history begins in 1433, when Jacqueline of Bavaria, Countess of Hainaut, granted Anthony of Croÿ "all the land, town, justice, seigneurie, peerage and appurtenances"; Philip the Good confirmed the grant days later. The House of Croÿ has owned the estate for nearly 600 years. Charles V, Marie de' Medici, Philip the Good and Charles the Bold stayed here, and William II of Orange and the Duke of Wellington held a war council shortly before Waterloo.

The Croÿ family has owned the castle and its estate for nearly 600 years. The entrance hall has kept its guardroom character since 1452, and its fireplace bears the family motto "Plus en sera de Croÿ". The park, redesigned with a rose garden by landscape architect René Pechère in 1961, retains vestiges of Saint-Feuillien Abbey, founded in 1125.

Access to the castle building is restricted, so it is worth contacting the local administration before planning a visit. The park around it is more accessible and can be explored on foot.

The entrance hall has barely changed since 1452 and keeps its guardroom character; its fireplace bears the family motto "Plus en sera de Croÿ". The kitchen fireplace hood is six metres long, resting on pilasters, and the outer wall is over two metres thick. The wrought-iron balcony above the porch was a gift from Louis XIV to the Maréchal duc de Croÿ.