Bangor International Airport (IATA: BGR, ICAO: KBGR, FAA LID: BGR) is a joint civil-military public airport on the west side of the city of Bangor, in Penobscot County, Maine, United States. Owned and operated by the City of Bangor, the airport has a single runway measuring 11,440 by 200 ft (3,487 by 61 m). Formerly a military installation known as Dow Air Force Base, Bangor International Airport remains home to the 101st Air Refueling Wing of the Maine Air National Guard, although most of the Air Force's aircraft and personnel left in the late 1960s. BGR covers 2,079 acres (841 ha) of land. It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2023–2027 categorized it as a non-hub primary commercial service facility.

The airport owes its prosperity to its location on major air corridors between Europe and the East Coast of the United States.

Bangor International is operated as an "enterprise fund", which means that the expense of operating it comes from airport revenue. Revenues are generated by air service operations, resident aviation-related industrial companies, real estate, cargo, international charter flights, and corporate/general aviation traffic. One of three international airports in the state, it serves the residents of central, eastern, and northern Maine as well as parts of Canada.

It was designated by NASA as an emergency landing location for the Space Shuttle.