Leutnant Karl Allmenröder (3 May 1896 – 27 June 1917) was a German World War I flying ace credited with 30 aerial victories.

The medical student son of a preacher father was seasoned in the trenches as an 18-year-old artilleryman in the early days of the First World War, earning promotion via battlefield commission to Leutnant on 30 March 1915.

Flying a scarlet Albatros D.III trimmed out with white nose and elevators, Allmenröder would score a constant string of aerial victories until 26 June 1917, the day before his death.

While serving in Poland fighting against the Imperial Russian Army, he was awarded the Iron Cross Second Class in March, 1915.

[2] Brothers Karl and Wilhelm Allmenröder transferred to Die Fliegertruppe (Imperial German Air Service) on 16 March 1916.

[2] After Manfred von Richthofen assumed command in January, 1917, Jagdstaffel 11 became one of the premier fighter squadrons of the German military.

[1] He achieved his victories flying an Albatros D.III in the squadron's scarlet livery, with his personal markings of white nose and elevators.

The German ace continued to inflict casualties on the Royal Flying Corps throughout the next 11 days, shooting down five enemy aircraft.

[1] [6] His 29th, and penultimate victory, was scored on 25 June against Canadian ace Flight Lieutenant Gerald Ewart Nash, who became a prisoner of war.

[6] The end of June 1917 saw Jagdstaffel 11 in frequent clashes with the opposing Canadian and British pilots of the Royal Naval Air Service.

[1] On 27 June, Allmenröder split his force into a trio flying at medium height as a decoy while another three Germans lurked well above.