London's third airport

Since the 1950s, London's primary passenger airport has been at Heathrow, with a second one at Gatwick. London's third airport may refer to:


 * London City Airport
 * London Stansted Airport
 * Luton Airport


 * The abandoned plans for Cublington Airport, and various proposals for a Thames Estuary Airport, all of which would have replaced Heathrow if built.