Boise Airport (IATA: BOI, ICAO: KBOI, FAA LID: BOI) (Boise Air Terminal or Gowen Field) is a joint civil-military airport three miles south of Boise in Ada County, Idaho, United States. The airport is operated by the city of Boise Department of Aviation and is overseen by an Airport Commission. It is by far the busiest airport in the state of Idaho, serving more passengers than all other Idaho airports combined and roughly ten times as many passengers as Idaho's second busiest airport, Idaho Falls Regional Airport.

Boise is a landing rights airfield requiring international general aviation flights to receive permission from a Customs and Border Protection officer before landing.

In addition to being a commercial and general aviation airport, Boise also functions concurrently as a USAF military facility as used by the 124th Fighter Wing (124 FW) of the Idaho Air National Guard on the Gowen Field Air National Guard Base portion of the airport. The 124 FW operates the A-10 Thunderbolt II aircraft.

The National Interagency Fire Center (NIFC) is based in the city of Boise and the Boise Airport is used for logistical support. The United States Forest Service (USFS) also uses Boise Airport as a base for aerial firefighting air tankers during the wildfire season.

Boise Airport had 1,487,764 enplaned passengers in 2015, growing from 1,378,352 passengers in 2014, for a total of 7.94% annual growth. BOI ranked 72nd in the nation in enplanements for 2015.