Castle Bon, Louis XIII style château in Montpellier, France.

Castle Bon is a Louis XIII style residence in Montpellier featuring a rectangular footprint with tall narrow windows and a gently pitched roof typical of French architecture. The exterior displays refined architectural details that give the building its character and distinctive appearance.

Philibert de Bon, first president of the Montpellier court of accounts, aides and finances, commissioned a country residence in August 1694 from Augustin-Charles d'Aviler, the king's architect in Languedoc. Built between 1694 and 1700 on the site of his mas de Terrade farm west of Montpellier, it introduced the pleasure-house model of Val, Saint-Cloud and Marly to the city. Burdened with debts, de Bon, by then marquis de Saint-Hilaire, sold it before his death in 1711. A 19th-century owner had it heavily remodelled between 1858 and 1862, and the park was replanted by landscapers Denis and Eugène Bühler.

The name Bon comes from Philibert de Bon, first president of the Montpellier court of accounts, who ordered the house in 1694. The 5.2-hectare park, replanted with rare species by Denis and Eugène Bühler in the 19th century, now belongs to the city and is public ground. In the basement, a nymphaeum shelters a fountain topped by a nude statue called "Diane".

The residence is located in Montpellier and easily reachable from the city center. Visitors should plan time to examine the exterior details from different angles to fully appreciate the fine architectural features.

The 19th-century owners kept d'Aviler's central block flanked by two short wings, but reversed his scheme: the wings open onto the entrance courtyard rather than the garden, unlike Flaugergues and Bionne. The 5.2-hectare park, replanted by Denis and Eugène Bühler, now belongs to the city and is public.