Pfennig (also Pfenning or Pfenninger) is a German surname. Notable people with the surname include: Frank Pfenning, professor of computer science Fritz Pfenninger Guillermo Pfening (born 1978), Argentine actor and director Norbert Pfennig (1925–2008), German microbiologist (born 1944), German jazz musician, lyricist (1880–1963), German architect (1937–2008), German trade unionist