Winchester (/ˈwɪntʃɪstər/, /-tʃɛs-/) is a cathedral city in Hampshire, England. The city lies at the heart of the wider City of Winchester, a local government district, at the western end of the South Downs National Park, on the River Itchen. It is 60 miles (97 km) south-west of London and 14 miles (23 km) from Southampton, its nearest major city. At the 2021 census, the built-up area of Winchester had a population of 48,478. The wider City of Winchester district includes towns such as Alresford and Bishop's Waltham and had a population of 127,439 in 2021. Winchester is the county town of Hampshire and contains the head offices of Hampshire County Council.
Winchester developed from the Roman town of Venta Belgarum, which in turn developed from an Iron Age oppidum. Winchester was one of the most important cities in England in the Anglo-Saxon period.