Naval Air Station (NAS) Sigonella (IATA: NSY, ICAO: LICZ) is an Italian Air Force base (Italian: Aeroporto "Cosimo Di Palma" di Sigonella), and a U.S. Navy installation at Italian Air Force Base Sigonella in Lentini, Sicily, Italy. The whole NAS is a tenant of the Italian Air Force, which has the military and the administrative control. It serves as an Italian base for the 41º Stormo Antisom (41st Antisubmarine Warfare Wing). NAS Sigonella acts also as a landlord to more than 40 other U.S. commands and activities. It is located 15 kilometres (9 mi) west and 11 km (7 mi) south of the city of Catania, and some 40 km (25 mi) south of Mount Etna.
The NAS is located in the western part of the large airport structure, while the Italian military base is located in the eastern part. Because of its location near the center of the Mediterranean Sea, NASSIG is well-placed to support operations by the U.S. 6th Fleet, other U.S. military units, and U.S. allies and coalition partners.