Deitz is a surname. Notable people with the surname include:
Alonzo E. Deitz (1836–1921), American lock manufacturer Doug Deitz (1914–1994), Australian rugby league player Richard Deitz (born 1965), American hedge fund manager Robert Deitz (born 1946), American intelligence officer and lawyer Shane Deitz (born 1975), Australian cricketer Terry Deitz (born 1959), United States Naval aviator and reality television show contestant Tom Deitz (1952–2009), American writer
See also Deitz Farm, a national historic district in West Virginia