Château de Morsang, Historical castle in Morsang-sur-Orge, France.

Château de Morsang is a 17th- and 18th-century building in Morsang-sur-Orge, Essonne. Its pale beige stone facade has five tall shuttered windows and a glazed double door with steps; a full-width stone balustrade balcony runs above, with a carved triangular pediment over the central upper window. A second section has an outdoor double staircase with wrought-iron railings leading to an arched doorway.

The present Château de Morsang was built in the 17th and 18th centuries. On 5 July 1979 its facades and roofs, the main staircase with its wrought-iron handrail, the library, the adjoining small and large ground-floor salons and the first-floor room facing the staircase were listed as monuments historiques. An April 2025 decree extended the listing to the main building, the orangery and its park, including two pavilions, the entrance gate, a built grotto, the basin and a rockwork cascade.

The château houses Morsang-sur-Orge's municipal médiathèque and a conservatoire de musique. A maison de l'environnement in the grounds holds an orangerie open to the public Monday to Friday. The name Morsang comes from the commune on the Orge, and the estate is now run jointly by the commune, the Syndicat de l'Orge and Cœur d'Essonne Agglomération.

The 17-hectare park is free and open all year; the château itself houses the municipal médiathèque and a music conservatory. The maison de l'environnement, with its orangerie, is open to the public Monday to Friday. Picnic tables are set out for visitors, and the site is reached from the A6 exits at Savigny-sur-Orge and Viry-Châtillon, with free parking nearby and the Parc du Château stop on tram line T12.

The 1979 listing named not only the facades and roofs but also the library, the adjoining small and large drawing rooms on the ground floor, and the bedroom facing the staircase on the first floor. An April 2025 decree extended protection to the orangery and its park, including two pavilions, the entrance gate, a grotto, a basin and a rocaille cascade.