Iberia (Spanish pronunciation: [iˈβeɾja]), legally incorporated as Iberia Líneas Aéreas de España, S.A. Operadora, Sociedad Unipersonal, is the flag carrier airline of Spain. Founded in 1927 and based in Madrid, it operates an international network of services from its main base of Madrid–Barajas Airport. Iberia, with Iberia Regional (operated by an independent carrier Air Nostrum) and with Iberia Express, is a part of International Airlines Group. In addition to transporting passengers and freight, Iberia Group carries out related activities, such as aircraft maintenance, handling in airports, IT systems and in-flight catering. Iberia Group airlines fly to over 109 destinations in 39 countries, and a further 90 destinations through code-sharing agreements with other airlines.

On 8 April 2010, it was confirmed that British Airways and Iberia had signed an agreement to merge, making the combined operation the third largest commercial airline in the world by revenue. Shareholders of both carriers approved the deal on 29 November 2010. The newly merged company, known as International Airlines Group (IAG), was established in January 2011, although both airlines continue to operate under their respective brands.