Humberto Delgado Airport (IATA: LIS, ICAO: LPPT), informally Lisbon Airport and previously Portela Airport, is an international airport located 7 kilometres (4.3 mi) northeast of the historical city centre of Lisbon, Portugal. With more than 35 million passengers per year, it is the 12th-largest airport in Europe in terms of passenger volume, and the busiest single-runway airport in mainland Europe. It also carries approximately 200,000 tonnes of cargo per year.

The airport is the main hub of Portugal's flag carrier TAP Air Portugal, including its subsidiary TAP Express, and is a hub for low-cost carriers Ryanair and easyJet. It is a focus city for Azores Airlines, euroAtlantic Airways, Hi Fly, and White Airways. It is a major hub for flights to and from South America, notably Brazil and Africa. The airport is run by the national airport operator ANA Aeroportos de Portugal, which in 2012 was granted under a 50-year-concession contract to the French group Vinci Airports, whose Portuguese branch is headed by José Luís Arnaut.

The airport is expected to be shut down after the Lisbon Luís de Camões Airport is fully operational, scheduled for 2034. In the meantime, Humberto Delgado Airport remains as one of the most congested airports of Europe, and one of the only major airports to have an approach path directly over the city which leads to noise pollution. Over 414,000 people live within a 5 km (3.1 mi) radius of the airport, the highest number among major airports in Europe.