Diepholz Air Base (Diepholz Airport, Advanced Landing Ground (ALG) B-114)

Diepholz Air Base is a joint-use civil-military airfield located 3.3 km southwest of Diepholz in Lower Saxony, Germany. The facility is controlled by the German Air Force (Bundeswehr).

Established in 1936 for the Luftwaffe, the airfield was seized by the British Army in April 1945. During this period, it was designated as Advanced Landing Ground B-114 under Royal Air Force control. The airfield closed following World War II but was returned to German Air Force control in 1957, at which point it became a NATO Air Base.

Historical occupants included the 2nd Flying Group of Helicopter Transport Wing 64, stationed at the base between 1968 and 1971. The facility has also hosted various logistical units of the German Air Force. In October 2011, the German Federal Ministry of Defence announced a reorganization of the German Armed Forces, resulting in a reduction of personnel at the base from 1,020 to 110. Under this restructuring, the base mission shifted to serve as a material storage site.

The infrastructure supports both military operations and civil aviation. Between 1968 and 1996, the airfield was utilized as a temporary motorsports venue known as the Diepholz Airfield Circuit. This circuit hosted rounds of the DRM touring car championship starting in 1972. Motorsports activities at the site were discontinued after 1998.