Dietel is a surname. Notable people with the surname include:
Andreas Dietel (born 1959), German speed skater Heinrich Gotthold Dietel (1839–1911), German textile industry entrepreneur Johann Ludwig Dietel, transcriber of the Dietel manuscript Paul Dietel (1860–1947), German mycologist
See also Dietel Palace, a neo-baroque palace in Sosnowiec, Poland Dietl