Corfe Castle is a fortification standing above the village of the same name on the Isle of Purbeck peninsula in the English county of Dorset. Built by William the Conqueror, the castle dates to the 11th century and commands a gap in the Purbeck Hills on the route between Wareham and Swanage. The first phase was one of the earliest castles in England to be built at least partly using stone when the majority were built with earth and timber. Corfe Castle underwent major structural changes in the 12th and 13th centuries.

In 1572, Corfe Castle left the Crown's control when Elizabeth I sold it to Sir Christopher Hatton. Sir John Bankes bought the castle in 1635, and was the owner during the English Civil War. His wife, Lady Mary Bankes, led the defence of the castle when it was twice besieged by Parliamentarian forces. The first siege, in 1643, was unsuccessful, but by 1645 Corfe was one of the last remaining royalist strongholds in southern England and fell to a siege ending in an assault. In March that year Corfe Castle was slighted on Parliament's orders. Owned by the National Trust, the castle is open to the public and in 2018 received around 237,000 visitors. It is protected as a Grade I listed building and a Scheduled Ancient Monument.

Corfe Castle is roughly triangular and divided into three parts, known as enclosures or wards.

Enclosed in the 11th century, the inner ward contained the castle's keep, also known as a donjon or great tower, which was built partly on the enclosure's curtain wall. It is uncertain when the keep was built though dates of around 1100-1130 have been suggested, placing it within the reign of Henry I. Attached to the keep's west face is a forebuilding containing a stair through which the great tower was entered. On the south side is an extension with a guardroom and a chapel. The two attachments postdate the construction of the keep itself, but were built soon after. To the east of the keep within the inner ward is a building known as the gloriette. Only ruins are left of the gloriette which was probably built by King John.

The remains of the west bailey, the stone wall with three towers, date from 1202 to 1204 when it was refortified. It resembles the bailey of Château Gaillard in Normandy, France, built for Richard I in 1198.

The civil parish of Corfe Castle stretches across the width of the Isle of Purbeck, with coasts facing both the English Channel and Poole Harbour. It, therefore, includes sections of both the low-lying sandy heathland that lies to the north of the castle and the rugged Jurassic Coast upland to the south.

The National Trust runs a shop and a tearoom in the village. The Corfe Model Village, located on the village square, is a 1/20th scale model that shows what the castle and village would have looked like in 1646 before the castle was slighted. Within the Church of St. Edward is an alabaster reredos inset with carvings in white marble, designed by the famous Victorian architect George Edmund Street R.A., which was presented by Lord Eldon in 1876. A cross in the square commemorates Queen Victoria's Diamond Jubilee of 1897. Next to the cross is a defunct village pump, bearing the village's arms. Mortons House Hotel was built in 1590 and is one of the most notable buildings in the village.