Stanwell is a village in the Spelthorne district, in Surrey, England. It is 16 miles (26 km) west of central London. A small corner of its land is used as industrial land for nearby Heathrow Airport. The rest of the village is made up of residential and recreational land. Historically part of the county of Middlesex, it has, like the rest of Spelthorne, been in Surrey since 1965. The village is to the south of the cargo-handling area of Heathrow Airport and to the east of the Staines Reservoirs. Stanwell is the northernmost settlement in Surrey, bordering Berkshire and Greater London.

Its recognisable extent has been substantially cut three times – all in the 20th century. Land was taken for reservoirs in about 1900; a few decades later land was taken into Heathrow Airport; and in 1995, after the completion of the M25 motorway, the settlement of Poyle (beyond Stanwell Moor) was detached from the Borough and reassigned to Colnbrook in the Borough of Slough.

Stanwell Moor is near the village and has multiple reservoirs around it. It was recognised as a manor in medieval times. It has a few pasture/horse-riding fields, horticultural businesses and flood meadows. It is centred 1 mile (1.6 km) from the historical nucleus of Stanwell and is part of the same ward and ecclesiastical parish.

There are two theories regarding the origin of the name Stanwell. One is that it was named after St Ann(e)'s well in the village, but according to all known records the parish church has always been dedicated to St Mary. The second is that it means 'stone well', referring to stony soil or the adjoining street to the south. The first few letters of the name are the same as in the name of neighbouring Staines-upon-Thames, which also is said to mean 'stones', in the same way as the Great Vowel Shift failed to influence the spelling and pronunciation of the contemporaneously pronounced Stane Streets (i.e. stone streets), the Old English for many of the stone-laid Roman roads in Britain

The Domesday Book of 1086 records 'Stanwelle' held by Walter, son of Othere. This places it among the large minority of head manors retained by men with Anglo-Saxon names. Its Domesday assets were: 15 hide, 4 mills worth £3 10s 0d and 375 eels, 3 weirs worth 1000 eels, 10 ploughs, meadow for 12 ploughs and woodland worth 12 hogs. It rendered £14 per year to its feudal system overlords. The fruitful watercourse was the western border of the village and of Middlesex, the River Colne West Bedfont may have been a hamlet of Stanwell in 1086; however, the dividing line between West Bedfont hamlet in Stanwell parish and East Bedfont in the parish of Bedfont (now in Greater London) may not have been drawn before the 11th or 12th century. West Bedfont along with Rudsworth are no longer used by residents (as localities, hamlets, neighbourhoods). In the Middle Ages the parish was mostly open fields

In 1603, Thomas Knyvet was granted the manor of Stanwell. Knyvet was the man who arrested Guy Fawkes in his attempt to blow up the Houses of Parliament. He was created Lord Knyvet in 1607, and in his will left money to found a free school in Stanwell, which was established in 1624. The building is no longer a school and now belongs to a housing association. It is Grade II* listed. However Thomas Knyvett College, bears his name in the twenty-first century.

James VI and I's infant daughter Mary died at Stanwell while in the care of the Knyvet household. Several members of the aristocracy lived there in the 17th and 18th centuries. The Cox's Orange Pippin was first grown c. 1830 by Richard Cox in his garden on the Bath Road within the parish, see Colnbrook which now has this piece of land.

An unknown species of rose was found in a local garden in 1838, and given the name of Stanwell Perpetual.