Château de Chastellux is a French castle with elements from the eleventh, thirteenth, fifteenth and nineteenth centuries. It is located in Chastellux-sur-Cure in the Yonne, Bourgogne-Franche-Comté.
This castle is still inhabited by the family who built it, a rarity in France. The oldest existing part of the building, the Saint-Jean tower, was built c. 1080 AD.
The main building was the first part to be registered as a monument historique in 1925. The Saint-Jean tower and the surrounding buildings were later classified in 1976 and 1989, respectively.