Schaefer
- Born after 1800
- Germany Schaefer (1877–1919), American professional baseball player
- Jacob Schaefer Sr (1850–1910), American professional billiards player
- Jacob Schaefer Jr (1894–1975) American professional billiards player
- Born after 1900
- Vincent Schaefer (1906–1993), American chemist and meteorologist who developed cloud seeding
- Jack Warner Schaefer (1907–1991), American fiction author
- Milner Baily Schaefer (1912–1970), American fisheries biologist
- William Donald Schaefer (born 1921), American state politician
- Udo Schaefer (born 1926), German Bahá'í author
- Will Schaefer (1928–2007), American composer
- Bill Schaefer (field hockey) (1925-2003), New Zealand field hockey player
- Kermit Schaefer (1923–1979), American writer, broadcast producer and blooper aficionado
- Daniel Schaefer (1936–2006), American national politician
- Bob Schaefer (born 1944), American professional baseball coach
- Henry F. Schaefer, III (born 1944), American computational and theoretical chemist, academic and Protestant educator
- Gerard John Schaefer (1946–1995), American serial killer
- Born after 1950
- Peter Schaefer (ice hockey) (born 1977), Canadian professional ice hockey player
- Nolan Schaefer (born 1980), Canadian professional ice hockey player
- Bradley E. Schaefer (living), American physics academic
- Kurt Schaefer (living), American academic
- Peter Schaefer (author) (living), American academic and religious history author
- Brenda Sue Schaefer (deceased), murder victim
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