Ernst Wiesner, also known as Arnošt Wiesner (January 21, 1890, in Malacky, Kingdom of Hungary, Austro-Hungarian Empire - July 15, 1971, in Liverpool) was a modernist architect, one of the foremost interwar period architects of Brno.
During 1908 to 1913 Wiesner studied at the Technical College and the Academy of Arts (taught by B. Ohmann) in Vienna. After the World War I he worked as an independent architect in the city of Brno, until 1939. Wiesner was a very active architect in the city between the World Wars. His work was greatly influenced by Adolf Loos and his pure constructions with their classicized balance and monumentality are amongst the best works to be constructed in Brno at that time.
Afterwards Wiesner emigrated to Great Britain where he joins the foreign anti-fascist resistance. After World War II he stayed in England. During 1948-50 he acted as a lecturer in the School of Architecture at the University of Oxford and during 1950-60 at the University of Liverpool. In 1969 he was nominated to the rank of honorary doctor by the University of Jan Evangelista Purkyně (now Masaryk University) in Brno.