Château de Bagatelle, Historical monument in Saint-Martin-des-Champs, France.

Château de Bagatelle is a manor house in Saint-Martin-des-Champs featuring an octagonal central section flanked by two rectangular pavilions at either end. The building displays windows characteristic of the Louis XV period, with a French-style garden positioned in front of its western facade.

Originally called Carman, the estate was built in the 18th century by Thomas-Charles de Morant. Its documented history begins with Pierre de Jollivet's written record in 1754.

The estate's name changed from Manoir de Carman to Bagatelle, and the west facade faces a French-style garden laid out to plans attributed to Le Nôtre. The Puyo family, owners from 1866, left a mark: Constant Puyo became a noted photographer, and Edmond Puyo served as mayor of Morlaix from 1866 to 1871.

The château stands in the commune of Saint-Martin-des-Champs, in Finistère, close to Morlaix. The French-style garden lies in front of the west facade, and the chapel of Sainte Anne, built in 1772, is on the grounds. The building is inscribed as a monument historique, so the exterior and grounds are the main points to see from outside.

The chapel was built in 1772 from granite quarried on Île Callot, an island in the bay off Carantec. The château itself passed in 1866 to Edmond Puyo, mayor of Morlaix from 1866 to 1871, and then to his son Constant Puyo, a photographer known for his work in the Pictorialist movement.