Kasteel Renswoude (Renswoude Castle), formerly called Borchwal, is a castle and knight's manor and estate nearby the village of Renswoude. The first house probably dates from the late 14th century. Perhaps the name refers to a borgwal (circular rampart) that surrounded the castle.

During the Dutch 'Golden Age' - in 1654 – the original house was demolished by order of Johan van Reede and replaced by the current country house in Dutch-classicist style. It was probably built on the medieval foundations. The castle has a special design, which gives it a double appearance. The white plastered back gives the building a real country-house appearance, while the front with its towers is more reminiscent of a castle. The facade of the main building is dominated by the large tower in the middle with a corner tower protruding on either side.

Kasteel Renswoude is surrounded by a park, which is open to the public. Nowadays the castle is divided into several apartments where some members of the castle owners' family reside.