Subic Bay is a bay on the west coast of the island of Luzon in the Philippines, about 100 kilometers (62 miles) northwest of Manila Bay. An extension of the South China Sea, its shores were formerly the site of a major United States Navy facility named U.S. Naval Base Subic Bay, which is now the location of an industrial and commercial area known as the Subic Bay Freeport Zone under the Subic Bay Metropolitan Authority.
Subic Bay International Airport (SBIA) serves as a secondary airport and a main diversion airport of the Ninoy Aquino International Airport. It is also the airport serving the immediate area of the Subic Bay Freeport Zone, the municipality of Morong, Bataan and the general area of Olongapo in the Philippines.