Gustav Kastner-Kirdorf (born 2 February 1881 in Trumpfsee-Warnitz; died 4 May 1945 in Berchtesgaden) was a German aviator who served in the Luftwaffe during the first and second World Wars.

With the outbreak of First World War Kirdford acted from 4 August to 15 September 1914, as General Staff Officer and leader of the flyer Detachment Deputy of the XIV Corps (German Empire).

On 1 August 1927 Kirdorf was employed by the Reichswehr as a civilian employee and graduated in that capacity until the end of September 1930 a secret aviator training in the Soviet Union.

After returning to Germany, he became the head of the advertising department of the German Air Sports Association.

From 1 April 1934 to the end of June 1938 Kirdorf became head of the flight readiness of the Ministry of Aviation (Nazi Germany).