Trier Air Base, also known as Trier Euren Airfield, is a former military airfield located in the southwest of Trier, a city in Rhineland-Palatinate, Germany. It was established in 1910. During World War I it was used by the Deutsche Luftstreitkräfte as both a Zeppelin and military airfield. Later, it was used by the Air Service, United States Army, Deutsche Luftwaffe, the United States Army Air Forces, and NATO forces until being closed in 1977, when the airfield was converted into an industrial park.

The Third Army Air Service was a United States Army Air Service organization stationed in France and Occupied Germany in the immediate aftermath of World War I. It was demobilized in Germany on 2 July 1919. There is no modern United States Air Force unit that shares its lineage and history.