The Castlebourne folly in the parish of Belbroughton, Worcestershire, England, was built as a sham castle towards the end of the eighteenth century and is similar in age and design to Clent Castle, another folly, about 2.2 miles (3.5 km) away in an adjacent parish of Clent.
In the middle nineteenth century a house, Castlebourne (originally Castle Bourne) was built in a Gothic castle style close to the folly and connected by a wall about 20 yards (18 m) long and 5 yards (4.6 m) high with an archway.
The folly, wall and house are designated as a Grade II listed building by English Heritage.
The central bay has a blocked pointed doorway with hood mould and returns.
The wall connecting the folly to the house faces south-west and has an embattled parapet above a moulded cornice.