Gustav Adolf Rein
German historian and professor
- Born: 1885-08-16 (Eisenach)
- Died: 1979-01-06 (Hamburg)
- Country of citizenship: Germany
- Occupation: historian; professor; university teacher
- Member of political party: Nazi Party
- Employer: University of Hamburg
- VIAF ID: https://viaf.org/viaf/5664780
- ISNI: https://isni.org/isni/0000000083389939
- WorldCat Identities ID: https://worldcat.org/identities/lccn-n82127776
- Library of Congress authority ID: https://id.loc.gov/authorities/names/n82127776