Brussels Airport (IATA: BRU, ICAO: EBBR) (also called Brussel-Nationaal / Bruxelles-National (Brussels-National) or Zaventem) is an international airport 6.5 NM (12.0 km; 7.5 mi) northeast of Brussels, the capital of Belgium. In 2017, more than 24 million passengers arrived or departed at Brussels Airport, making it the 23rd busiest airport in Europe. It is located partially in Zaventem, partially in the Diegem area of Machelen, and partially in Steenokkerzeel, in the Flemish Region of Belgium. It is home to around 260 companies, together directly employing 20,000 people and serves as the home base for Brussels Airlines and TUIfly Belgium.

The company operating the airport is known as The Brussels Airport Company N.V./S.A.; before 19 October 2006, the name was BIAC (Brussels International Airport Company), which was created by Belgian law through a merger of BATC with the ground operations departments of the RLW/RVA. Since 2011, the airport has been owned by the Toronto-based Ontario Teachers' Pension Plan (39%), Macquarie Group (Macquarie European Infrastructure Fund I and Macquarie European Infrastructure Fund III) (36%) and the Belgian State (25%).