Kurt Gruber (1896 – 4 April 1918) was an Austro-Hungarian flying ace during the First World War who held the rank of Offiziersstellvertreter.

[1][3] Gruber scored his first aerial victories on 14 April, 2 May, and 6 June 1916, with Godwin Brumowski manning the observer's guns in the Albatros B.I on the 2nd.

The 6 June victory was the first by a lone Austro-Hungarian aviator; flying without a gunner, he used his front machine gun to force a Morane-Saulnier Parasol to land.

[4] This late in the war, he was still flying an Albatros D.III without interrupter gear; the airplane's machine gun was angled to the left to fire past the end of the propeller arc.

[4] Gruber was shot down and killed on 4 April 1918 in combat with Sopwith Camels of No 66 Squadron, moments after his final claim.

He was posthumously awarded the Gold Bravery Medal for the fourth time, becoming one of only two quadruple recipients of the decoration (Julius Arigi).