Washington is a village and civil parish in the Horsham District of West Sussex, England.

In the 2001 census 1,930 people lived in 703 households, of whom 820 were economically active.

There is one pub, the Frankland Arms, a primary school and a village hall with an adjoining sports field.

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 Wiston.

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.