Ambérieu-en-Bugey Air Base (French: Détachement Air 278 Ambérieu-en-Bugey) (ICAO: LFXA) is a front-line French Air and Space Force (French: Armée de l'air et de l'espace or ALA) base located approximately 5 km north-northwest of Ambérieu-en-Bugey, in the Ain department of the Rhône-Alpes region in eastern France.

The air base was constructed during World War II as all-weather temporary field built by the United States Army Air Forces XII Engineer Command during late August 1944 after German forces were removed from the area.

It was built on a graded surface using Pierced Steel Planking for runways and parking areas, as well as for dispersal sites.

In addition, tents were used for billeting and also for support facilities; an access road was built to the existing road infrastructure; a dump for supplies, ammunition, and gasoline drums, along with a drinkable water and minimal electrical grid for communications and station lighting.

The 324th Fighter Group, which flew P-40 Warhawks from the field during September 1944, after which it moved up to Tavaux.