London Heathrow Airport or Heathrow is the principal airport for London, England. The United Kingdom's biggest airport, Heathrow is also Europe's busiest airport for passenger traffic, and handles more international passenger traffic than any other airport in the world. Heathrow is owned and operated by BAA, which is itself owned by an international consortium led by the Spanish Ferrovial Group, and is the primary hub of British Airways and Virgin Atlantic Airways and a major hub for bmi.

Located west of Central London, England, Heathrow has two parallel main runways running east-west and four terminals. Terminal 5 is under construction and is scheduled to open on 27 March 2008. Construction of Heathrow East to replace Terminal 2 and The Queens Building is planned to start in 2008 and be completed by 2012, and Terminals 3 and 4 will be refurbished during this period. In November 2007 a consultation process began for the building of a new third runway.

Heathrow Airport has a United Kingdom Civil Aviation Authority (CAA) Public Use Aerodrome Licence (Number P527) that allows flights for the public transport of passengers or for flying instruction.