Château de Bagneux, Medieval castle in Bournan, France.

The château de Bagneux is a fortified castle built from the 13th to the 15th century on a square plan with four corner towers, two of which are truncated. The two surviving towers keep conical slate roofs, known as poivrières, and machicolations. Mullioned windows pierced in the towers and facade mark the shift from military to residential use.

The fortress was built between the 13th and 15th centuries on a square plan with four corner towers, two of them truncated. The estate appears as Baniolus in 816, Banneoli in the 11th century, Baigneux and Bagneux de Bournan in the 17th century. It was a fief of the castle of Sainte-Maure, and its first known lord, Guillaume de Beygnoux, was living in 1331. It was listed as a monument historique in 1927.

The mullioned windows in the towers show how the fortress evolved into a noble residence. These architectural details remain visible reminders of how the building's purpose changed over time.

The site is listed as a historical monument since 1927 and remains private property, which means views from outside are available but internal access may be restricted. It sits in the Indre-et-Loire region and is easily spotted given its prominence in the surrounding landscape.

The estate appears as Baniolus in 816 and as Banneoli in the 11th century, and its lordship depended on the castle of Sainte-Maure. Guillaume de Beygnoux, the first known lord, was living in 1331. In September 1912 President Armand Fallières watched the capture of Bagneux from the château, which closed the grandes manœuvres de l'ouest.