Kieffer is a surname. Notable people with the surname include:
Aldine Silliman Kieffer (1840–1904), American music writer André Kieffer (1903-1984), French politician in Chad Charles Kieffer (1910–75), American athlete Eduardo Gudiño Kieffer (1935–2002), Argentine writer Guy-André Kieffer (born 1949), French-Canadian journalist John Kieffer, American information theorist 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 (born 1979), French volleyball player Philippe Kieffer (1899–1962), French naval officer Robert Kieffer (born 1946), Canadian politician Susan Kieffer (born 1942), American geologist
See also Kiefer