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.

Surrey is a ceremonial county in South East England and one of the home counties. It is bordered by Greater London to the northeast, Kent to the east, East and West Sussex to the south, and Hampshire and Berkshire to the west. The largest settlement is Woking.