Trenk is a surname. Notable people with this name include:
Ann Trenk, American mathematician Franjo Trenk (1711–1749), Austrian soldier and nobleman Hans Trenk, German commander of World War I submarine Henric Trenk (1818–1892), Swiss-born Romanian artist Lieut. Trenk (died 1913), German airship officer, victim of the Johannisthal air disaster Willy Trenk-Trebitsch (1902–1983), Austrian actor