Château de Bois-Seigneur-Isaac is an 18th-century stately home in Ophain-Bois-Seigneur-Isaac, Braine-l'Alleud, Walloon Brabant, Belgium. Originally a 12th-century feudal fortress guarding the County of Hainaut, it was transformed into an elegant residence in 1737, featuring a classic French façade with wide arched bay windows and a triangular pediment. A round tower with arrow slits recalls its military heritage. The grounds include a charming French garden and English-style park with centuries-old trees. Owned by the Snoy family for five generations, including Jean-Charles Snoy et d'Oppuers, a co-signatory of the Treaty of Rome, the château opens to the public on select heritage days and weekends.
