Arundel (/ˈærəndəl/ or locally /ˈɑːndəl/) is a market town and civil parish in a steep vale of the South Downs, West Sussex, England.
The much-conserved town has a medieval castle and Roman Catholic cathedral. Although smaller in population than most additional parishes, Arundel has a museum and comes second astern much larger Chichester in its number of listed buildings in West Sussex. The River Arun runs through the eastern side of the town.
Arundel was one of the boroughs reformed by the Municipal Reform Act 1835. From 1836 to 1889 the town had its own Borough police force subsequently a strength of three. In 1974 it became share of the Arun district, and is now a civil parish following a town council.