Westmalle Castle, Protected medieval castle in Westmalle, Belgium.

Westmalle Castle is a stone castle complex with light grey walls standing behind a rectangular stretch of water and a flat lawn. At the left end rises a tall round tower capped by a steep dark conical roof pierced with small dormer windows. Attached to its right is a long, low wing with a dark, steeply pitched roof and rows of light-framed windows, followed by a shorter section with a central door and dormers above.

The site began around 1100 as a fortified farmstead and was rebuilt as a castle in 1561 under Evrard de Cottereau. Over the centuries the building passed through different noble families before eventually being taken over by a conservation foundation.

The castle's name comes from the village of Westmalle in the Campine region. A 1650 avenue still links the estate to the village church, and the building kept its 1561 appearance well enough to be listed as a protected monument in 1978. After the last resident baroness died in 2022, the municipality of Malle bought the property, with most of the funding from Stichting Kempens Landschap.

The castle is private and not open to visitors; the best public view is from the lawn and water side, where the round tower with its dark conical roof and the long low wing stand out. The village of Westmalle lies in the municipality of Malle, in the Campine region of Flanders.

The castle changed hands between merchants, barons and noble families before a landscape foundation took it over. This varied ownership history shows that such estates were not simply power seats but also circulated as economic assets among different social groups.