The Château du Bois Thibault is a 15th-century ruined castle in the commune of Lassay-les-Châteaux, Pays de la Loire, France.

The Château du Bois Thibault was soon occupied by a company of Scotsmen, fighting on behalf of France, who fortified themselves there, but were overrun by the English.

He constructed the northwestern part of the castle, and added additional architectural details to the other already existing structure, including the pretty armrest overlooking the inner courtyard and the staircase in the adjacent tower.

[2] During the French Wars of Religion, the Huguenots damaged the chapel and destroyed the mausoleum dedicated to Louis du Bellay.

The Cultural Association of Lassay-les-Châteaux offers guided tours, as well as occasional entertainment, including medieval dinners and scavenger hunts.