Gorleston-on-Sea, historically and colloquially known as Gorleston, is a seaside town in the borough of Great Yarmouth in Norfolk, England. It lies to the south of Great Yarmouth, on the opposite side of the mouth of the River Yare. Historically in Suffolk, it was a port town at the time of the Domesday Book. It was incorporated into Great Yarmouth in 1836. Gorleston's port became a centre of fishing for herring along with salt pans used for the production of salt to preserve the fish. In Edwardian times the fishing industry rapidly declined and the town's role changed to that of a seaside resort.

The Borough of Great Yarmouth is a local government district with borough status in Norfolk, England. It is named after its main town, Great Yarmouth, and also contains the town of Gorleston-on-Sea and a number of villages and rural areas, including part of The Broads. Other notable settlements include Caister-on-Sea, Hemsby, Hopton-on-Sea and Winterton-on-Sea.