Walton Common (grid reference ST428738) is a 25.5 hectare biological Site of Special Scientific Interest (SSSI) near the village of Walton in Gordano, North Somerset, notified in 1991. The Common which is both a Scheduled Ancient Monument and an SSSI, is covered by a Countryside Stewardship agreement with the Countryside Agency. The Common remains in private ownership and the Avon Wildlife Trust has a 10-year lease to manage it as a nature reserve. The site has two saucer shaped round barrows from the Bronze Age, and the Walton Common banjo enclosure, a banjo enclosure from the late Iron Age that may be a univallate hillfort, with associated fields.