Dietz is a surname, and may refer to: Cyrus E. Dietz (1876-1929), Illinois Supreme Court Justice Hendrik Casimir II of Nassau-Dietz Howard Dietz (1896-1983), US-American lyric writer and librettist G. O. Dietz, American football coach Michael Dietz (born 1971), US-American actor Park Dietz (born 1948), US-American forensic psychiatrist Richard (Dick) Allen Dietz (1941-2005), US-American baseball player (catcher) Robert E Dietz (1818 - 1897), US-American industrialist (R.E. Dietz Company)… (More on Dietz)