Rettig (nickname of the greengrocer or radish farmer) is a surname. Notable people with the surname include:
- Alvin Rettig (born 1963), American former Arena football fullback/linebacker
- Charles P. Rettig (born 1956), American attorney serving as Commissioner of Internal Revenue
- Chase Rettig (born 1991), American football quarterback for Boston College
- Haviv Rettig, Israeli-American journalist
- James R. Rettig (1950–2022), American librarian and former president of the American Library Association (2008–2009)
- Lorna Rettig, English curler, participated in the 2010 European Curling Championships – Women's tournament as a member of England's group B team
- Otto Rettig (1894–1977), American baseball pitcher
- Raúl Rettig (1909–2000), Chilean politician and lawyer
- Tommy Rettig (1941–1996), American child actor and computer software engineer and author
Fictional characters:
- Lancer Rettig, fictional character in the novel Endymion by Dan Simmons
See also
- 8474 Rettig, main-belt asteroid
- Rettig Report, 1991 report on human rights abuses in Chile under Augusto Pinochet
- Krzan, Poland (German: Rettig), a village in Greater Poland
- Rettig ICC, manufacturer of heating systems
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