Spelthorne is a local government district with borough status in Surrey, England. Its council is based in Staines-upon-Thames; other settlements in the area include Ashford, Sunbury-on-Thames, Shepperton, Stanwell and Laleham. It is named after the medieval Spelthorne Hundred which had covered the area.

Staines-upon-Thames is a market town in northwest Surrey, England, around 17 miles west of central London. It is in the Borough of Spelthorne, at the confluence of the River Thames and Colne. Historically part of Middlesex, the town was transferred to Surrey in 1965. Staines is close to Heathrow Airport and is linked to the national motorway network by the M25 and M3. The town is part of the Greater London Built-up Area.