Château d'Ardelay, Medieval castle in Les Herbiers, France.

Château d'Ardelay is a castle in Les Herbiers featuring 15th-century defensive structures including a square keep and machicolations overlooking the inner courtyard. Access leads through a spiral staircase connecting multiple levels and rooms that are open during exhibition hours.

A wooden castle stood on a motte surrounded by a palisade and ditch in the 10th century. It was later replaced by a stone castle with a second enclosure that took in the church and cemetery. The first known lords were the Pareds family, then the Chantemerle. The castle was built in the 15th century on the site of the older motte, with later phases in the 16th and 18th centuries.

The castle is named after Ardelay, the former commune it stands in, now part of Les Herbiers. Since its purchase by the municipality in 1984 and restoration, it has served as an exhibition space, and the white "EXPOSITION" panel at the foot of the keep announces these shows. The lords of Ardelay included the Vivonne family, and François de La Rochefoucauld became seigneur of Ardelay in 1627 through his marriage to Andrée de Vivonne.

The castle stands in Ardelay, now part of Les Herbiers, and has been listed as a monument historique since 1927. It was bought by the municipality of Les Herbiers in 1984 and restored, then opened as an exhibition space. Visits take in the square keep that served as the lord's living quarters.

The castle was bought by the municipality of Les Herbiers in 1984 and restored, after German troops had partly destroyed it during the Second World War. It has served as an exhibition space since then; a white panel reading "EXPOSITION" stands at the foot of the keep.