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Herman Potočnik (pseudonym Hermann Noordung) (December 22, 1892 - August 27, 1929) was a Slovene rocket engineer and pioneer of cosmonautics (astronautics). He is chiefly remembered for his work addressing the long-term habitation of space.

With his many ideas he became one of the founders of astronautics. His concepts were first taken seriously only by the amateur rocketry movement in Germany, the Verein für Raumschiffahrt (VfR - "Spaceflight Society"), centered on Hermann Oberth and his co-workers. In its Russian edition, the book may also have influenced Sergey Korolev's circle. More locally, Viennese engineers dismissed his work as fantasy.

Potočnik's described geostationary satellites (first put forward by Konstantin Tsiolkovsky) and discussed communication between them and the ground using radio, but fell short of the idea of using satellites for mass broadcasting and as telecommunications relays (developed by Arthur C. Clarke in his Wireless World article of 1945). The wheel-shaped space station served as an inspiration for further development by Wernher von Braun (another former VfR member) in 1953.