Wilhelm Stiassny (15 October 1842, Pressburg (Bratislava) – 11 July 1910, Bad Ischl) was a Jewish Austrian architect.
In 1867 Stiassny was appointed delegate to the Paris Exposition by the Ministry of Commerce, and the following year he settled in Vienna as an architect.
Until 1905 he oversaw the construction of 180 palaces, schools, residences, factories, hospitals, and synagogues, including the Rothschild Hospital at Währing (1873), the Hall of Ceremonies in the Jewish section of the Vienna Central Friedhof, the Königswarter Institute for the Blind at Hohewarte, the Kindergarten in the second district of Vienna, the Rothschild Hospital at Smyrna, and the synagogues at Malacky, Jablonec nad Nisou, Čáslav, and Weinberge (Vinohrady, now a part of Prague).
In 1895, Stiassny founded the Society for the Conservation and Preservation of Art and Historical Monuments of Judaism, the world's first Jewish museum.
[2] He also served as head of the Jewish Colonization Association in Vienna.