Fregattenleutnant (Frigate Lieutenant) Friedrich Lang (17 September 1894 – 26 April 1937) was a World War I flying ace.

Friedrich Lang was born an Austrian citizen of Austria-Hungary, though his birth date and birthplace are unknown.

Aboard the SMS Balaton, he first saw combat at this time, winning a Second Class award of the Silver Bravery Medal.

Lang closed to 150 meters on one of the Farmans between the Skumbi River delta and Cape Laghi, and his gunner opened fire.

After a ten minute machine gun duel, the Italian Farman jettisoned its bombs and crashlanded on the sea near one of their destroyers.

The Farman's French air crew finally ceded way at 0800 and they glided down to the sea's surface near a destroyer.

It was decided to establish a dedicated fighter detachment at nearby Altura airfield; Lang was a founding member.

This transition from flying a mixture of aircraft types to concentrating on a fighter would work to Lang's advantage.

His fourth victim was forced to land; an Austro-Hungarian motor torpedo boat found it adrift and sank it.

[6] Almost three months later, at 1555 hours on 12 August 1918, Lang caught an Italian Macchi L.3 flying boat aloft at only 100 meters above the Adriatic Sea.