Madrid-Barajas International Airport is the main international airport serving Madrid, Spain. It is the country's largest and busiest airport, the world's tenth busiest airport  and Europe's fourth. It opened in 1928, and has grown to be one of the most important aviation centres of Europe. The airport derives its name from the adjacent town of Barajas, which has its own metro station on the same rail line serving the airport.

The Madrid-Barcelona air shuttle service, known as the "Puente Aéreo" (in Spanish) or "Pont Aeri" (in Catalan), literally "Air Bridge", is the world's busiest route, with the highest number of flight operations (971 per week) in 2007. The schedule has been reduced since February 2008, when a Madrid-Barcelona high-speed rail line was opened, covering the distance in 2½ hours, and quickly became popular. Barajas serves as the gateway to the Iberian peninsula from the rest of Europe and the world, and is a particularly key link between Europe and Latin America. The airport is the primary hub and maintenance base for Iberia Airlines. Consequently, Iberia Airlines is responsible for more than 60 percent of Barajas' traffic.

Terminal 4 houses all Iberia flights and all Oneworld alliance member airlines including British Airways, American Airlines, LAN Airlines, among others. Terminals T1, T2 and T3 operate Air Europa and Spanair, as well as all member airlines of Skyteam and Star Alliance, including AeroMexico, Air France, Alitalia, Korean Air, Delta Air Lines, Continental Airlines, Air China, Thai Airways, US Airways, and Lufthansa, among others.

In 2008, more than 50.8 million passengers used Barajas.

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