Wiston is a scattered village and civil parish in the Horsham District of West Sussex, England. It lies on the A283 road northwest of Steyning.
The parish covers an area of . In the 2001 census 221 people lived in 86 households, of whom 120 were economically active.
Chanctonbury Ring, a hill fort based ring of trees atop Chanctonbury Hill on the South Downs, lies on the border of the parish and the neighbouring parish of Washington. Chanctonbury Hill is a Site of Special Scientific Interest as an uncommon woodland type on a chalk escarpment, providing habitat for many species including the protected Great Crested Newt.