Adelaide Airport (IATA: ADL, ICAO: YPAD), also known as Adelaide International Airport, is an international, domestic and general aviation airport serving Adelaide, South Australia, Australia, located approximately 6 km (4 mi) west of the Adelaide central business district. Adelaide Airport is the fifth-busiest airport in Australia measured by passenger movements, serving a record-breaking 8.7 million passengers in the 2025 financial year, including over 1 million international passengers. It has been operated privately by Adelaide Airport Limited under a long-term lease from the federal government since 29 May 1998.

First established in 1955, Adelaide Airport operates flights to over 30 destinations within Australia, Oceania, Asia, and soon to North America. The airport also serves as a hub for Virgin Australia, a focus city for Qantas, and as an operating base for various airlines, including Jetstar. Since 2005, flights have been operated through a combined domestic and international terminal, having replaced the original separate terminals. Adelaide Airport is capable of handling large aircraft such as the Airbus A380 and Boeing 747, the latter of which was a regular at the airport in previous years.

The facility handles an average of over 250 flights daily, and spans a total area of 785 hectares (1,940 acres) of airport property.

An early "Adelaide airport" was an aerodrome constructed in 1921, allowing a mail service between Adelaide and Sydney. The aerodrome was built on 24 ha (59 acres) of land in Albert Park, now part of the neighbouring suburb of Hendon, which took over from the Northfield Aerodrome. The demand on aviation soon grew substantially, with Parafield Airport being developed in 1927 to enable the first passenger airline services from Adelaide. With a further growth in aviation, a new site for the current Adelaide Airport was selected in the suburb of West Beach, which was then split to form the dedicated Adelaide Airport suburb in 1991, in January 1946. An alternative airport site was also considered in Port Adelaide, which included a seaplane facility, but was considered inferior and too far from the central business district.

Construction in the chosen site took place in 1947 and flights commenced in 1954, with Parafield Airport being turned into a private and military aviation facility, now operating as a public training airport. With regular transport operations commencing on 16 February 1955, an annexe to one of the large hangars at the airport served as the first passenger terminal, until the Commonwealth Government provided funds for the construction of a temporary building.

In May 1998, Adelaide Airport Limited purchased the long-term leases of Adelaide Airport and Parafield Airport from the Government of Australia. The consortium comprised Manchester Airport, Serco, UniSuper, and Macquarie Bank. As at December 2023, the shareholders of Adelaide Airport Limited were UniSuper (51%), Hostplus (15%), IFM Investors (15%), Igneo Infrastructure Partners (15%), and Perron Group (4%).

In July 1998, the runway was extended by 570 metres to 3.1 kilometres. Prior to the 2005 terminal redevelopment, the original separate terminals had only two aircraft bays and a single jetbridge with limited space for passengers, check-in desks were also small and waiting space was limited. A new control tower was also built west of the terminal, with the old control tower maintained for additional operations.

In October 2006, the new terminal was named the Capital City Airport of the Year at the Australian Aviation Industry Awards in Cairns. In March 2007, Adelaide Airport was rated the world's second-best airport in the 5–15 million passengers category at the Airports Council International (ACI) 2006 awards in Dubai.