Farleigh Hungerford Castle, sometimes called Farleigh Castle or Farley Castle, is a medieval castle in Farleigh Hungerford, Somerset, England. The castle was built in two phases: the inner court was constructed between 1377 and 1383 by Sir Thomas Hungerford, who made his fortune as steward to John of Gaunt. The castle was built to a quadrangular design, already slightly old-fashioned, on the site of an existing manor house overlooking the River Frome. A deer park was attached to the castle, requiring the destruction of the nearby village. Sir Thomas's son, Sir Walter Hungerford, a knight and leading courtier to Henry V, became rich during the Hundred Years War with France and extended the castle with an additional, outer court, enclosing the parish church in the process. By Walter's death in 1449, the substantial castle was richly appointed, and its chapel decorated with murals.

Sir Edward Hungerford (1596–1648) of Corsham, Wiltshire and of Farleigh Castle in Wiltshire, Member of Parliament, was a Parliamentarian commander during the English Civil War. He occupied and plundered Salisbury in 1643, and took Wardour and Farleigh castles.