Littlehampton is a town, seaside resort and civil parish in the Arun District of West Sussex, England. It lies on the English Channel on the eastern bank of the mouth of the River Arun. It is 52 miles south south-west of London, 19 miles west of Brighton and 10 miles east of Chichester. The parish covers an area of 11.35 km2. The suburban area of the town has a population of approximately 55,000.