
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.

The following is the list of World War I aces from Australia. During the war Australian pilots served in a range of units in the Australian Flying Corps (AFC) and in the British Royal Naval Air Service (RNAS), Royal Flying Corps (RFC) and later the Royal Air Force (RAF). Australia was the only Dominion to have its own independent air arm during the war. Pilots were considered to be "aces" after they had shot down five or more enemy aircraft; 81 Australians are believed to have achieved this feat, with the highest scorer being Robert Alexander Little, who is credited with 47 air victories.

This list of World War I flying aces from Austria-Hungary contains the names of aviators from the countries ruled by the Habsburg dynasty. Austria-Hungary was a constitutional union of the Austrian Empire (Cisleithania) and the Kingdom of Hungary (Transleithania) which existed from 1867 to 1918, when it collapsed as a result of defeat in World War I. Its territory contained a melange of nationalities. Although the aces of the K.u.k. Luftfahrtruppen owed their military allegiance to the Austro-Hungarian Empire as a whole, they came from various ethnic groups. Despite the Hungarian government's policy of Magyarization, many inhabitants of that kingdom clung to their ethnic identities. The breakup of the Austro-Hungarian Empire post World War I saw the formation of independent nations from some of these ethnic groups.

This list of World War I flying aces from Hungary contains the names of aces from the territory of modern-day Hungary, which formed part of the Austro-Hungarian Empire. Austria-Hungary was a constitutional union of the Austrian Empire (Cisleithania) and the Kingdom of Hungary (Transleithania) which existed from 1867 to 1918, when it collapsed as a result of defeat in World War I.

Three of the flying aces of World War I were ethnic Serbs or born in the territory of the modern-day Serbian Republic. They were:





