Eddisbury hill fort, also known as Castle Ditch, is an Iron Age hill fort near Delamere, Cheshire, in northern England. Hill forts are fortified hill-top settlements constructed across Britain during the Iron Age. Eddisbury is the largest and most complex of the seven hill forts in the county of Cheshire. It was constructed before 200–100 BC and expanded in 1–50 AD. In the 1st century AD, the Romans slighted the site. It was reoccupied in the 6th–8th centuries AD, and an Anglo-Saxon burh was probably established at Eddisbury in 914. In the medieval and post-medieval periods quarrying and farming have damaged the site. Ownership is currently split between the Forestry Commission and a local farm. Eddisbury is protected as a Scheduled Ancient Monument.