The Château du Jonchet[a] is a French Renaissance château located on the banks of the Aigre River in the former commune of Romilly-sur-Aigre (which merged into the new commune of Cloyes-les-Trois-Rivières in 2017) in the Eure-et-Loir department in the region of Centre-Val de Loire, in northern France.

Following the end of World War II, the château was badly damaged during the 1950s, but was completely restored by its next owner, the architect Fernand Pouillon.

Aristotle Onassis and his partner Maria Callas considered purchasing the château shortly in the early 1960s around the time his divorce was finalized from his first wife Tina.

[1] When Hubert de Givenchy died in March 2018, Philippe Venet inherited the noble 17th century residence and sold it to Hubert's nephews James and his brother Olivier de Givenchy, shortly before his own death in February 2022.

[12] Under Hubert de Givenchy's ownership, the property featured "labyrinthine boxwood hedges and topiary inspired by the monastery of San Giorgio in Venice, a rose garden designed by the late Bunny Mellon, a greenhouse, an artificial lake, a private chapel, a moat filled with water from the Loir, an indoor pool, and a dog cemetery.