Château de Trept, Medieval castle in Trept, France.

Château de Serrières, also called château de la Poype de Serrières, is a former fortified house in Trept, Isère. The pale beige stone complex has a long low wing with a steep dark roof and two square towers with projecting corbels and shallow hip roofs, plus a small round turret at one end. Windows are small and sparse, some with pale shutters.

The castle was built in the late 13th or early 14th century as a fortified house (maison forte) and was regularly modified and enlarged until the 17th century. It belonged to the La Poype family. In 1992 the castle, together with its old forge, dovecote and terrace retaining walls, was listed as a monument historique. On 17 March 2025 a fire damaged its outbuildings.

The castle belonged to the La Poype family, whose name survives in the alternative title château de la Poype de Serrières. Since 1995 it has been owned by the Fondation Renaud, a cultural foundation based at Fort de Vaise in Lyon's 9th arrondissement. The castle is not open to the public.

The castle is private property of the Fondation Renaud and is not open to the public, so visits inside cannot be booked. The complex stands on the territory of Trept in Isère, and its outbuildings were damaged by a fire on 17 March 2025. The castle, old forge, dovecote and terrace retaining walls were listed as monuments historiques on 18 May 1992.

The 18 May 1992 listing covers not only the castle but also the old forge, the dovecote and the retaining walls of the terraces. On 17 March 2025 a fire struck the castle's outbuildings. The castle itself is not open to the public; it belongs to the Fondation Renaud, a cultural foundation based at Fort de Vaise in Lyon's 9th arrondissement.