Brønnøysund Airport (Norwegian: Brønnøysund lufthavn; IATA: BNN, ICAO: ENBN) is a regional airport located at the town of Brønnøysund, in Brønnøy Municipality, Nordland county, Norway. The airport is owned and operated by the state-owned Avinor and serves the southern part of Helgeland. It has a 1,200-by-30-meter (3,937 ft × 98 ft) runway numbered 03–21 and is served by Widerøe, which operates their Bombardier Dash 8 aircraft to Oslo, Trondheim, Bodø, Bergen and other airports in Helgeland. The airport also serves offshore helicopter flights by CHC Helikopter Service to Norne and temporary oil rigs in the Norwegian Sea. In 2014, the airport served 117,471 passengers, making it the second-busiest regional airport in Norway, after Florø Airport.

Brønnøysund received seaplane services in 1935, at first operated by Norwegian Air Lines and later by Widerøe. Plans for short take-off and landing airports in Northern Norway were launched in 1965; construction started in 1967 and Brønnøysund Airport opened along with three nearby airports on 1 June 1968. Originally served using Twin Otter aircraft, Widerøe replaced them with Dash 7 aircraft in 1982 and Dash 8 aircraft in 1992. Offshore helicopter traffic started in 1983. The runway was originally 800 meters (2,625 ft); it was extended to 1,000 meters (3,281 ft) in 1987 and to the current length in 1999.