Eynsford Castle is a stone Norman castle in the English county of Kent, within the civil parish bounds of the village of Eynsford. It is largely non-rebuilt and has seen natural decay but virtually no plunder for building materials. It was historically the manor owning most of the land of the village. Built in 1088 and occupied by local nobility but ransacked in the 14th century it fell into decay and is now in the care of English Heritage and open to the public.