Luis Muñoz Marín International Airport (IATA: SJU, ICAO: TJSJ, FAA LID: SJU) is a joint civil-military international airport located in suburban Carolina, Puerto Rico, three miles (5 km) southeast of San Juan. It is named for Luis Muñoz Marín, Puerto Rico's first democratically elected governor, and was known as Isla Verde International Airport (Aeropuerto Internacional de Isla Verde) until it was renamed in February 1985. It is the busiest airport in the Caribbean region by passenger traffic. Over 4 million passengers boarded a plane at the airport per year according to the Federal Aviation Administration, making it the 48th busiest airport overseen by said federal agency.

The airport is owned by the Puerto Rico Ports Authority and managed by Aerostar Airport Holdings, a public–private partnership which was awarded a lease by the government of Puerto Rico to operate and manage the airport for 40 years beginning in 2013. SJU is the second international airport to be privatized in the United States or its territories, and, as of 2013, is the only currently privatized airport in the nation. Taxis and rental cars can transport travelers to and from the airport. The airport serves as a gateway to the Caribbean islands. SJU covers 1,600 acres (647 ha) of land.