Anderida is an ancient Roman fort at Pevensey, near Eastbourne in Sussex, England.

Anderida was built about A.D. 300 as part of a scheme of land-defence against the Saxon pirates. It was repaired, probably by the great Stilicho, about A.D. 400. After the Norman Conquest, William the Conqueror utilized it for a Norman castle. It was later used as a defensive emplacement in World War II. Its massive Roman enceinte still stands but little damaged.