Indira Gandhi International Airport (IATA: DEL, ICAO: VIDP) is the primary international airport serving New Delhi, the capital of India, and the National Capital Region (NCR). The airport, spread over an area of 5,106 acres (2,066 ha), is situated in Palam, Delhi, 15 km (9.3 mi) southwest of the New Delhi Railway Station and 16 km (9.9 mi) from New Delhi city centre.

Named after Indira Gandhi (1917–1984), the former Prime Minister of India, it is the busiest airport of India in terms of passenger traffic since 2009. It is also the busiest airport in the country in terms of cargo traffic. In the financial year of 2023-24, the airport handled 7.36 crore (73.6 million) passengers, the highest ever in the airport's history. As of 2024, it is the tenth-busiest airport in the world, as per the latest rankings issued by the UK-based air consultancy firm, OAG. It is the second-busiest airport in the world by seating capacity, having a seating capacity of over 36 lakh (3.6 million) seats, and the busiest airport in Asia by passenger traffic, handling over 6.55 crore (65.5 million) passengers in 2023. In fact, it is routinely one of the busiest airports in the world, according to the Airports Council International rankings.

The airport was operated by the Indian Air Force before its management was transferred to the Airports Authority of India. In May 2006, the management of the airport was passed over to Delhi International Airport Limited (DIAL), a consortium led by the GMR Group. In September 2008, the airport inaugurated a 4,430 m (14,530 ft) runway.