The Château de Tonquédec is a castle in the commune of Tonquédec in the Côtes d'Armor département of France. It is one of the most visited monuments in the Côtes d'Armor. One of the most impressive French medieval sites, this château-fort, stands in a pleasant green forested countryside about 8.5 km (5.3 mi) south of Lannion. The present castle was built in the 15th century, on the site of an earlier 12th-century castle.