Viktor Pietschmann (27 October 1881 – 11 November 1956) was an Austrian ichthyologist at the Vienna Museum of Natural History. He was the curator of the fish collection from 1919 to 1946 and made collecting trips to the Barents Sea, Greenland, Mesopotamia, Armenia, Hawaii, Romania, and Poland. Pietschmann described many new fish, including several species of shark, and had more than 50 publications over his career. He served in the Austrian army in World War I, during which he was stationed in the Ottoman Empire. While there, Pietschmann witnessed the Armenian genocide and took many photographs of the deportees. He joined the National Socialist German Workers' Party (NSDAP) in 1932 and remained a member until the end of World War II.