Otto Muehl (16 June 1925 – 26 May 2013) was an Austrian artist, who was known as one of the co-founders as well as a main participant of Viennese Actionism and for founding the Friedrichshof Commune. In 1943, Muehl had to serve in the German Wehrmacht. There he registered for officer training. He was promoted to lieutenant, and in 1944 he took part on infantry battles in the course of the Ardennes Offensive. After the war, he studied teaching German and History, and Pedagogy of Art at the Wiener Akademie der bildenden Künste.