Arun is a local government district in West Sussex, England. The district is named for the River Arun. Its main towns are Littlehampton and Bognor Regis.
It was formed on April 1, 1974 from Littlehampton and Bognor Regis urban districts, the borough of Arundel, and parts of Worthing Rural District and Chichester Rural District.
Arun or 'Aruna' refers the charioteer of Sun or the rising Sun, according to Hindu scriptures. It is a common male name in India.