The following are lists of World War I flying aces. Historically, a flying ace was defined as a military aviator credited with shooting down five or more enemy aircraft during aerial combat. The term was first used by French newspapers, describing Adolphe Pégoud as l'as, after he downed seven German aircraft.
Feldwebel Franz Lahner (1893-1966) was a Austro-Hungarian World War I flying ace credited with five aerial victories. In later life, he was a lumber merchant and a Luftwaffe officer.
Ensign Ernst Krislanovich Leman (1894–1917) was a Russian World War I flying ace credited with five aerial victories.
OberleutnantKurt Nachod served during World War I in the Austro-Hungarian Air Force, in which he was credited with downing five enemy aircraft, ranking him 42nd in the list of Austro-Hungarian flying aces. Unusually, all of these victories were gained while acting as an observer.
MarescialloGuido Nardini was a World War I flying ace credited with six aerial victories.
Tenente Giorgio Pessi was a World War I flying ace born in Austria-Hungary who chose to fly for Italy. He was credited with six aerial victories.
Kurt Gruber was an Austro-Hungarian flying ace during the First World War who held the rank of Offiziersstellvertreter. He was credited with eleven aerial victories, 5 shared with other pilots.
Oberleutnant Franz Rudorfer was an Austro-Hungarian World War I flying ace credited with eleven confirmed and two unconfirmed aerial victories.
Oberleutnant Ernst Strohschneider was an Austro-Hungarian flying ace during World War I. He was credited with 15 confirmed aerial victories during his rise to the simultaneous command of two fighter squadrons. He died in a flying accident on 21 March 1918.
Feldwebel Stefan Fejes was an Austro-Hungarian flying ace credited with 16 confirmed and 4 unconfirmed aerial victories during World War I. By war's end, he had not only received numerous decorations, he had been personally promoted by his emperor.
Stabsfeldwebel Ferdinand Udvardy was a Hungarian conscript into the military of the Austro-Hungarian Empire who became a flying ace credited with nine aerial victories. Upon the dissolution of Austria-Hungary, Udvardy became a Hungarian citizen, and in the aftermath of World War I, defended his new nation against invasion.
SergenteGiovanni Nicelli was an Italian World War I flying ace. He was credited with eight or nine confirmed aerial victories, and died in service to his nation on 5 May 1918.