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|Born||8 March 1911
|Died||17 October 1940
over the English Channel
|Years of service||1933–40|
|Awards||Knight's Cross of the Iron Cross|
Mayer was born 8 March 1911 at Rouffach, in Alsace-Lorraine. He served with the Condor Legion in the Spanish Civil War with 1. Staffel, Jagdgruppe 88, claiming eight victories. On his return from Spain Oberleutnant Mayer was posted to 1. Staffel, Jagdgeschwader 53 (JG 53—53rd Fighter Wing), becoming Staffelkapitän (squadron leader) in October 1939. He claimed his first victory of World War II on 5 November 1939 downing a French Potez 63. Mayer claimed eight more victories during the Battle of France, including five aircraft shot down on 14 May 1940 alone. During the Battle of Britain he then shot down two Hurricanes over the Isle of Wight on 12 August 1940. On 25 August Mayer shot down a Hurricane for his 15th victory, that of F/L AWA Bayne (8 victories) of 17 Squadron, who bailed out. The next day Mayer shot down two Spitfires. One of his victim was ace Sgt Cyril Babbage (7 victories) of No. 602 Squadron RAF, who bailed out. Hauptmann Mayer was awarded the Ritterkreuz on 3 September.
Mayer was made Gruppenkommandeur I./JG 53 on 1 September 1940, and recorded his 30th victory on 15 September. On 17 October 1940 Mayer took off on a test flight and never returned, his body washing up on the English coast 10 days later. He was possibly a victim of RAF ace F/L D. McMullen of No. 222 Squadron RAF. During his career he was credited with 39 aerial victories, 8 in the Spanish Civil War and 31 in World War II.
- Spanienkreuz in Gold mit Schwerten
- Front Flying Clasp of the Luftwaffe
- Iron Cross (1939)
- 2nd Class
- 1st Class
- Knight's Cross of the Iron Cross on 3 September 1940 as Hauptmann and Staffelkapitän in the 1./Jagdgeschwader 53
- Ramsay; "After the Battle"
- Fellgiebel 2000, p. 250.
- Fellgiebel, Walther-Peer (2000) . Die Träger des Ritterkreuzes des Eisernen Kreuzes 1939–1945 — Die Inhaber der höchsten Auszeichnung des Zweiten Weltkrieges aller Wehrmachtteile [The Bearers of the Knight's Cross of the Iron Cross 1939–1945 — The Owners of the Highest Award of the Second World War of all Wehrmacht Branches] (in German). Friedberg, Germany: Podzun-Pallas. ISBN 978-3-7909-0284-6.
- Obermaier, Ernst (1989). Die Ritterkreuzträger der Luftwaffe Jagdflieger 1939 – 1945 [The Knight's Cross Bearers of the Luftwaffe Fighter Force 1939 – 1945] (in German). Mainz, Germany: Verlag Dieter Hoffmann. ISBN 978-3-87341-065-7.
- Patzwall, Klaus D.; Scherzer, Veit (2001). Das Deutsche Kreuz 1941 – 1945 Geschichte und Inhaber Band II [The German Cross 1941 – 1945 History and Recipients Volume 2] (in German). Norderstedt, Germany: Verlag Klaus D. Patzwall. ISBN 978-3-931533-45-8.
- Scherzer, Veit (2007). Die Ritterkreuzträger 1939–1945 Die Inhaber des Ritterkreuzes des Eisernen Kreuzes 1939 von Heer, Luftwaffe, Kriegsmarine, Waffen-SS, Volkssturm sowie mit Deutschland verbündeter Streitkräfte nach den Unterlagen des Bundesarchives [The Knight's Cross Bearers 1939–1945 The Holders of the Knight's Cross of the Iron Cross 1939 by Army, Air Force, Navy, Waffen-SS, Volkssturm and Allied Forces with Germany According to the Documents of the Federal Archives] (in German). Jena, Germany: Scherzers Militaer-Verlag. ISBN 978-3-938845-17-2.
- Spick, Mike (1996). Luftwaffe Fighter Aces. New York: Ivy Books. ISBN 978-0-8041-1696-1.
- Die Wehrmachtberichte 1939-1945 Band 1, 1. September 1939 bis 31. Dezember 1941 (in German). München: Deutscher Taschenbuch Verlag GmbH & Co. KG. 1985. ISBN 3-423-05944-3.
Hauptmann Albert Blumensaat
|Commander of I. Jagdgeschwader 53
1 September 1940 – 17 October 1940
Hauptmann Hans-Heinrich Brustellin