World War II Horst Ademeit (8 February 1912 – 7 August 1944) was a German Luftwaffe fighter ace and recipient of the Knight's Cross of the Iron Cross with Oak Leaves (German: Ritterkreuz des Eisernen Kreuzes mit Eichenlaub) during World War II.

[1] Ademeit fought in the Battle of Britain and the Eastern Front where he was officially credited with 166 aerial victories before his disappearance during a mission over Latvia on 7 August 1944.

On 9 December 1938, Ademeit was made an officer cadet of the reserves and received flight training.

Staffel of JG 54, replacing Oberleutnant Hans Beißwenger who was killed in action the day before.

[4] On 4 February 1944, Ademeit succeeded Hauptmann Walter Nowotny as Gruppenkommandeur (group commander of I. Gruppe of JG 54.

[6] On 7 August 1944, Ademeit, flying a Focke-Wulf Fw 190 A-5 (Werksnummer 5960 — factory number) led a flight of four Fw 190s to the combat area near Kreutzburg on the right bank of the Daugava, where they intecepted a flight of ten Ilyushin Il-2s and Yakovlev Yak-9 fighters at 15:17.

[7] He pursued the Il-2 eastwards near Dünaburg across the front line, but failed to return from this mission and was considered missing in action.