Heathrow or Heath Row was a small hamlet in the ancient parish of Harmondsworth, Middlesex, England, on the outskirts of what is now Greater London. It was demolished in 1944 for the construction of London Heathrow Airport. The hamlet was a mile and a half east of Longford; its site is now part of the London Borough of Hillingdon.
A sizeable Neolithic settlement is believed to have been in the Heathrow area. Many artefacts have been found in the gravel around what is now the airport, and the Colne Valley. Waste pits filled with struck flint, arrowheads and fragments of pottery were also found in the area, indicating a settlement, though none other remains of such a settlement.
Heathrow was one of the last settlements formed in the parish of Harmondsworth. Its name was previously La Hetherewe (about year 1410, first known mention), Hithero, Hetherow, Hetherowfeyld, Hitherowe, and Heath Row, and came from the Middle English spelling of "heath row" ("row of houses on or by a heath"). Old maps show Heathrow as a row of houses along the northwest side of the curve of Heathrow Road (see map), which until 1819 ran along a northwest edge of an extensive area of common land which included Hounslow Heath. The earliest written appearance of the name, as spelt "Heathrow", was in 1453.
Ordnance Survey maps dating back to before the Second World War show an earthwork, a quarter of a mile to the south of the Bath Road, that had been excavated in 1723 by William Stukeley. He believed it to have been a Roman settlement, and named it "Caesar's Camp".