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. It commands a gap in the Purbeck Hills on the route between Wareham and Swanage, situated on a steep hill created by two streams eroding chalk rock. The site serves as both a historic landmark and a residential community within the civil parish.

Built by William the Conqueror soon after 1066, the castle dates to the 11th century and was one of the earliest in England to use stone. It underwent major structural changes in the 12th and 13th centuries, including the construction of a stone keep by Henry I. The castle left Crown control when Elizabeth I sold it in 1572, and after being slighted on Parliament's orders in March 1645, it was eventually bequeathed to the National Trust in 1981.

The medieval castle is a classic image of a Norman fortification, featuring an inner ward, outer bailey, and a keep built from Purbeck limestone. The village below is constructed almost entirely from local grey Purbeck limestone, comprising East Street and West Street linked at the Square. Notable features include the Gloriette in the inner bailey and the Model Village Gardens, which displays a half-twentieth scale model of the castle as it appeared in 1646.

The site draws visitors with its impressive ruined Norman architecture and its role as a Royalist stronghold during the English Civil War. Lady Mary Bankes led the defence against Parliamentarian forces in 1643 and 1645, events that define its heritage appeal. The castle is open to the public, offering insights into its history as a royal residence and prison for figures such as Eleanor, Duchess of Brittany.

In 2011, the Corfe Castle civil parish had a population of 1,355. The local economy historically relied on clay quarrying, which provided major employment until the 20th century. Access is available via the A351 road or the Swanage Railway heritage line. In 2018, the castle received around 237,000 visitors and is protected as a grade I listed building and a scheduled monument.