Lancing is a large coastal village and civil parish in the Adur district of West Sussex, England, on the western edge of the Adur Valley. It occupies part of the narrow central section of the Sussex coastal plain between smaller Sompting to the west, larger Shoreham-by-Sea to the east, and the parish of Coombes to the north. Excluding definitive suburbs it may have the largest undivided village cluster in Britain. However, its economy is commonly analysed as integral to the Brighton/Worthing/Littlehampton conurbation. Its settled area beneath the South Downs National Park covers 3.65 square miles, the majority of its land.

Adur is a local government district in West Sussex, England. It is named after the River Adur which flows through the area. The council is based in the town of Shoreham-by-Sea, and the district also contains the town of Southwick, the large village of Lancing and a modest rural hinterland inland. The district had a population of 64,626 at the 2021 census.