Basildon is a town in the borough of the same name, in the county of Essex, England. It had a recorded population of 115,955 at the 2021 census. In 1931, the town had a population of 1,159.

The Borough of Basildon is a local government district with borough status in Essex, England. It is named after its largest town, Basildon, where the council is based. The borough also includes the towns of Billericay and Wickford and surrounding rural areas.