Basildon (/ˈbæzɪldən/ BAZ-il-dən) 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.
It lies 27 miles (43 km) east of Central London, 11 miles (18 km) south of the city of Chelmsford and 10 miles (16 km) west of the city of Southend-on-Sea. Nearby towns include Billericay to the north-west, Wickford to the north-east and South Benfleet to the south-east. It was created as a new town after World War II in 1948, to accommodate the London population overspill from the conglomeration of four small villages: Pitsea, Laindon, Basildon (the most central of the four) and Vange.