The Borough of Eastleigh is a local government district with borough status in Hampshire, England. It is named after its main town of Eastleigh, where the council is based. The borough also contains the town of Hedge End along with several villages, many of which form part of the South Hampshire urban area.
The neighbouring districts are Fareham, Winchester, Test Valley, Southampton and (across Southampton Water) New Forest. Water bounds much of the borough, with Southampton Water and the River Hamble bordering the east and southwest of the district. The borough lies within the Hampshire Basin.