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Otto Fönnekold (15 February 1920 – 31 August 1944) was a German Luftwaffe military aviator during World War II, a fighter ace credited with 136 aerial victories—that is, 136 aerial combat encounters resulting in the destruction of the enemy aircraft. All but three of his victories were claimed over the Soviet Air Forces in about 600 combat missions.
Born in Hamburg, Fönnekold was trained as a fighter pilot and posted to Jagdgeschwader 52 (JG 52–52nd Fighter Wing) in late 1942. Fighting on the Eastern Front, he claimed his first aerial victory on 7 September 1942 during Case Blue, the German strategic 1942 summer offensive in southern Russia. On 12 January 1944, Fönnekold was credited with his 100th aerial victory and was awarded the Knight's Cross of the Iron Cross on 26 March 1944. In April 1944, he was appointed Staffelkapitän (squadron leader) of 5. Staffel (5th squadron) of JG 52. He was killed in action on 31 August 1944 by a strafing US North American P-51 Mustang at the airfield in Ssaß-Budak.