Diestel is a German-language surname. Notable people with the surname include:
Arnold Diestel (1857–1924), German politician, First Mayor of Hamburg Erich Diestel (1892–1973), Wehrmacht general during World War II Joseph Diestel (1943–2017), American mathematician Ludwig Diestel (1825–1879), German Protestant theologian Peter-Michael Diestel (born 1952), German lawyer and politician, last East German Minister of the Interior Reinhard Diestel, German mathematician Kate Diestel, Ukrainian philosopher See also
de:Diestel