Nazi UFOs (German: Haunebu, Hauneburg-Geräte, or Reichsflugscheiben) are advanced aircraft or spacecraft that Nazi Germany supposedly developed during World War II and Nazi scientists continued to develop afterwards. These craft appear not only in fiction but also in various historical revisionist writings. They often appear in connection with esoteric Nazism, an ideology that supposes the possibility of Nazi restoration by supernatural or paranormal means.
Nazi UFO theories agree with mainstream history on the following points:
Nazi Germany claimed the territory of New Swabia, sent an expedition there in 1938, and planned others.
Nazi Germany conducted research into advanced propulsion technology, including rocketry and Viktor Schauberger's turbine work.
Some UFO sightings during World War II, particularly those known as foo fighters, were thought to be enemy aircraft.
The earliest non-fictional reference to Nazi flying saucers appears to be a series of articles by and about Italian turbine expert Giuseppe Belluzzo. The following week, German scientist Rudolph Schriever claimed to have developed flying saucers during the Nazi period.
Aeronautical engineer Roy Fedden remarked that the only craft that could approach the capabilities attributed to flying saucers were those being designed by the Germans towards the end of the war. Fedden also added that the Germans were working on a number of very unusual aeronautical projects, though he did not elaborate upon his statement.