Kieffer is a surname. Notable people with the surname include:Aldine Silliman Kieffer (1840–1904), American music writer Charles Kieffer (1910–75), American athlete Eduardo Gudiño Kieffer (1935–2002), Argentine writer Guy-André Kieffer, French-Canadian journalist Josef Kieffer (1900–1947), German Nazi executed for war crimes Jean-Jacques Kieffer (1857–1925), French entomologist Leo Kieffer (1930–2017), American politician and businessman Oliver Kieffer, French volleyball player Philippe Kieffer (1899–1962), French naval officer Robert Kieffer, Canadanian politician Susan Kieffer, American geologist
