Castle of Quinsonnas, Medieval castle in Sérézin-de-la-Tour, France.

The castle of Quinsonnas stands on a hill between Sérézin-de-la-Tour and Nivolas-Vermelle. Its medieval perimeter walls and two round towers to the north survive, while the 17th-century rebuilding filled the central courtyard and added two residential wings, south and east. The best-preserved south wing consists of two pavilions separated by a large porch; the east wing rests on a row of half-buried vaulted rooms.

The castle is an old fortified site dating from the 12th century and reworked in the 17th century. In 1224 Berlion de la Tour granted the use of the fief of Quinsonnas to his brother Jocelyn Viguier de Romans. On 27 October 1609 the estate was acquired by François de Bonne de Lesdiguières, last Constable of France, who exchanged it on 17 August 1611 for lands of the marquisate of Vizille.

The lime trees in the main courtyard were most likely planted on the orders of François de Bonne de Lesdiguières, who owned the estate from 1609 to 1611 before trading it for the lands of the Vizille marquisate. The Quinsonnas family, whose name the castle and hamlet carry, counted Arthus Pourroy among its members, seigneur de Quinsonnas from 1597 to 1679 and receveur général du Dauphiné.

The building is closed to the public; it can be seen from its entrance gate, reached by a small road open to motor vehicles and pedestrians between Sérézin-de-la-Tour and Nivolas-Vermelle, near the hamlet of Quinsonnas. The nearest station is Cessieu, under five kilometres from the castle and its grounds.

The lime trees in the main courtyard were probably planted on the orders of François de Bonne de Lesdiguières, who owned the estate from 27 October 1609 until he exchanged it on 17 August 1611 for the lands of the marquisate of Vizille. The castle is closed to the public, but its entrance gate can be reached by a small road open to motor vehicles and pedestrians.