Buncton (/ˈbʌntən, ˈbʌŋktən/) is a small village in the Horsham District of West Sussex, England, part of the civil parish of Wiston 0.5 miles (0.80 km) north. It lies to the east of the A24 road, 11 miles (18 km) as the crow flies, about 18 miles (29 km) by road south of Horsham and 6 miles (9.7 km) north west of Shoreham by Sea.
Buncton existed as a settlement at the time of the Domesday survey in 1086, when it was called Bongetune. Its origins lie in a manor whose land lay within two exclaves of the parish of Ashington within the Rape of Bramber, one of the six ancient subdivisions of Sussex. The medieval manor house has vanished, but a 17th-century replacement still stands.