Johann Daniel Achelis
German medical historian
- Born: 1898-06-07 (Göttingen)
- Died: 1963-09-21 (United States of America)
- Country of citizenship: Germany
- Occupation: medical historian; university teacher
- Member of political party: Nazi Party (since: 1933-05-01)
- Member of: German Academy of Sciences Leopoldina; Heidelberg Academy for Sciences and Humanities (period: 1935-01-01 through 1939-01-01; role: ordinary member)
- Participant in: Nuremberg Medical Trial (date: 1947-04-26; role: affiant)
- Military branch: Luftwaffe
- Employer: Boehringer Mannheim GmbH (since: 1950-01-01); Heidelberg University School of Medicine (period: 1942-01-01 through 1945-01-01; position held: dean); Leipzig University
- Educated at: Leipzig University; University of Bonn
- VIAF ID: https://viaf.org/viaf/85857856
- ISNI: https://isni.org/isni/0000000078587471
- WorldCat Identities ID: https://worldcat.org/identities/lccn-n85806425
- Library of Congress authority ID: https://id.loc.gov/authorities/names/n85806425