Ashford is a town in Spelthorne, in Surrey, England, 14 mi (23 km) west of central London. Its name derives from a crossing point of the River Ash, a distributary of the River Colne. Historically part of Middlesex, the town has been part of Surrey since 1965. Ashford consists of relatively low density low- and medium-rise buildings, none of them being high rise. If excluding apartments most houses are semi-detached. In 2011 it had a population of 27,382.

The River Ash is a small, shallow river in Surrey, England. Its course of 10 kilometres (6.2 mi) is just outside Greater London. Work has been carried out to re-align, clear and build up a small, Littleton head of water and create two backwaters. One backwater dates to the medieval period; the other to the 1990s. It flows as one of the six distributaries of the River Colne from the south of Staines Moor immediately south of the Staines Bypass eastwards through the rest of the borough of Spelthorne before meeting the River Thames.