Eddisbury hill fort, a Scheduled Ancient Monument, is the largest and most complex of the seven Iron Age hill forts, or fortified hill-top settlements, in Cheshire. Located on Eddisbury Hill of the Mid Cheshire Ridge near the village of Delamere, Eddisbury falls within the southern group of Cheshire forts, together with Kelsborrow Castle and Oakmere hill fort.
Eddisbury was constructed before 200–100 BC and expanded in 1–50 AD. The fort was partially destroyed by the Romans in the 1st century AD, to prevent the site being reused. It was reoccupied in the 6th–8th centuries AD, and an Anglo-Saxon burh was probably established there in 914 by Æthelflæd, daughter of Alfred the Great. Excavations were carried out on the site in 1935–38.
The fort measures 200 by 380 metres and is surrounded by two ramparts separated by a ditch 10 metres wide and 0.5 metres deep. Quarrying and ploughing have damaged the site, leading to it being assessed as "at high risk". The land is partly owned by the Forestry Commission and partly in private ownership.