Château d'Ainay-le-Vieil is a 14th-century castle built on the grounds of an earlier 12th century castle in Ainay-le-Vieil, Cher, France. After having bought the castle from Jacques Cœur, Charles de Bigny built a pre-Renaissance Louis XII style chateaux from 1500 to 1505. The castle has been listed as a Monument historique since 1968 by the French Ministry of Culture. The castle, now part of Jacques Cœur's tourist route, has been nicknamed "the little Carcassonne" because of its circular shape. Today the castle is one of the best preserved fortresses of the 14th century.