Louis Armstrong New Orleans International Airport (IATA: MSY, ICAO: KMSY, FAA LID: MSY) is an international airport under Class B airspace in Kenner city, Jefferson Parish, Louisiana, United States. It is owned by the city of New Orleans and is 11 miles (18 km) west of downtown New Orleans. A small portion of Runway 11/29 is in unincorporated St. Charles Parish. Armstrong International is the primary commercial airport for the New Orleans metropolitan area and southeast Louisiana.

MSY covers 1,500 acres (607 ha) of land. At an average of 4.5 feet (1.4 m) above sea level, MSY is the third lowest-lying international airport in the world, only behind Amsterdam Airport Schiphol in the Netherlands, which is 11 feet (3.4 m) below sea level, and Atyrau International Airport in Kazakhstan, which lies 72 feet (22 m) below sea level.