Havré Castle, Medieval castle in Mons, Belgium

Havré Castle is a fortified residence in Mons with a rectangular layout built from sandstone and surrounded by a moat. The complex preserves defensive walls and towers from its long history as a stronghold.

The castle was built in 1226 as a defensive post to protect Mons along the Haine river from attack. Major rebuilding took place around 1600 when Charles-Alexandre de Croy reconstructed and modernized the structure.

The castle takes its name from the village of Havré, and its owners carried the title Marquis of Havré, as with Charles-Alexandre de Croÿ. Since 1979 the non-profit association Les Amis du Château des Ducs d'Havré has worked to safeguard the site, and the castle rooms can be rented for weddings and evening events.

The castle remains partially in ruins with ongoing restoration work, so visiting is possible only on set dates. Tours are typically arranged through local associations that manage access to the site.

The castle's survival into the 20th century ended in 1930, when a large part of the building collapsed and turned it into the historic ruin protected by royal decree on 15 September 1936. Since 1979 the non-profit association Les Amis du Château des Ducs d'Havré has worked to safeguard the site, and its rooms can be rented for weddings and evening events.