Georg Carl Stetter (23 December 1895 – 14 July 1988) was an Austrian-German nuclear physicist. Stetter was Director of the Second Physics Institute of the University of Vienna. He was a principal member of the German nuclear energy project, also known as the Uranium Club. In the latter years of World War II, he was also the Director of the Institute for Neutron Research. After the war, he was dismissed from his university positions, and he then became involved in dust protection research. After his dismissal was overturned, he became Director of the First Physics Institute of the University of Vienna, and he began research on aerosols. In 1962, Stetter became a full Member of the Austrian Academy of Sciences. In that same year, the Academy established their Commission for Clean Air, and Stetter served as its chairman until 1985.
In 1914, Stetter studied at the Technische Hochschule Wien (today, the Technische Universität Wien). After one semester, he volunteered for military service. He began his service with the Radiodetachement des Kampftruppen und Kampfverbände Telegraphenregiments St. Pölten (Radiodetachement of the Combat Troops and Battle Units Telegraph Regiment St. Pölten). Later he was transferred to the leadership of a field radio station. Among other awards for his military service, he received the Goldenes Militär-Verdienstkreuz (Golden Military Merit Cross). His service awakened in him interest in electromagnetic waves and electronics. In 1919, after World War I, Stetter studied physics and mathematics at the Universität Wien (University of Venna). He received his doctorate in 1922.
Upon receipt of his doctorate, Stetter became a teaching assistant at the II. Physikalische Institut der Wiener Universität (Second Physics Institute of the University of Vienna).
The close association of the II. Physikalische Institut with the Institut für Radiumforschung (Institute for Radium Research) of the Österreichischen Akademie der Wissenschaften (ÖAW, Austrian Academy of Sciences) in Vienna brought Stetter in close contact with nuclear physics. Stetter’s pioneering work in the use of electronics to measure the energy of nuclear particles earned him the Haitingerpreis (Haitinger Prize) of the ÖAW in 1926. He completed his Habilitation at the University in 1928. In 1935, he became the President of the Wiener Chemisch-Physikalischen Gesellschaft (Vienna Chemico-Physical Society). In 1937, he became Vertreter des Gauvereins Österreich im Vorstand der Deutschen Physikalischen Gesellschaft (Austrian District Association representative of the Board of the German Physical Society). In 1938, he became a member of the Deutschen Akademie der Naturforscher (German Academy of Natural Scientists) in Halle. In 1939, he became an ordentlicher Professor (ordinarius professor) and Director of the II. Physikalische Institut.In 1940, he became a Corresponding Member of the Österreichischen Akademie der Wissenschaften (Austrian Academy of Sciences). He was also the Director of the Vereins zur Förderung des physikalischen und chemischen Unterrichts (Association for the Promotion of Teaching Physics and Chemistry). Stetter also joined the Nazi Party.