Middleton-on-Sea is a village, civil parish and an electoral ward in the Arun District of West Sussex, England, lying to the east of Bognor Regis and neighbouring Felpham. The parish also contains the settlements of Elmer and Ancton. The southern half is urban and the northern rural. The village has a pub, "The Beresford Arms" named after Viscount William Beresford, who was a General in the British Army and also commander of the Portuguese armed forces.