Dietl is a surname. Notable people with the surname include: Bo Dietl (born 1950), American police detective, media personality and 2017 NYC mayoral candidate Eduard Dietl (1890–1944), German general Helmut Dietl (1944–2015), German film director and writer Jaroslav Dietl (1929–1985), Czechoslovak scenarist of series Józef Dietl (1804–1878), mayor of Kraków