Wilhelm Spies (26 August 1913 – 27 January 1942) was a German Luftwaffeace and recipient of the Knight's Cross of the Iron Cross with Oak Leaves during World War II. Wilhelm Spies was shotdown on 27 January 1942 near Suchinitschi, Russia. He was posthumously promoted to Major and awarded the Oak Leaves to his Knight's Cross on 5 April 1942. During his career he was credited with 20 aerial victories, 10 over the Western Front and 10 over the Eastern Front.
Obermaier, Ernst (1989). Die Ritterkreuzträger der Luftwaffe Jagdflieger 1939 - 1945 (in German). Mainz, Germany: Verlag Dieter Hoffmann. ISBN 3-87341-065-6.
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 (in German). Jena, Germany: Scherzers Miltaer-Verlag. ISBN 978-3-938845-17-2.
Spick, Mike (1996). Luftwaffe Fighter Aces. New York: Ivy Books. ISBN 0-8041-1696-2.
Thomas, Franz (1998). Die Eichenlaubträger 1939–1945 Band 2: L–Z (in German). Osnabrück, Germany: Biblio-Verlag. ISBN 3-7648-2300-3.