Longford is a suburban village in the London borough of Hillingdon, England. It is immediately northwest of London Heathrow Airport, which is in the same borough. It is the westernmost settlement in Greater London, close to the borders of Berkshire and Surrey. It was formerly part of Harmondsworth by tithes, land tax, vestry and still by Church of England parish. As it has never had a church it can also be considered a hamlet. Until 1965 it was in the historic county of Middlesex.