Siegfried Ruff
German physician; defendant at the Nuremberg Doctors' Trial (1907-1989)
- Born: 1907-02-19 (Friemersheim)
- Died: 1989-04-22 (Bonn)
- Country of citizenship: Germany
- Occupation: aircraft pilot; physician; university teacher
- Member of political party: Nazi Party
- Participant in: Nuremberg Medical Trial (role: affiant, defendant)
- Significant person: Fritz Sauter (role: criminal defense lawyer); Georg August Weltz (role: colleague); Hans Wolfgang Romberg (role: assistant)
- Employer: German Aviation Research Institute (role: section chief; since: 1934-01-01); University of Bonn
- Educated at: Humboldt University of Berlin; University of Bonn
- VIAF ID: https://viaf.org/viaf/34949136
- ISNI: https://isni.org/isni/0000000083718106
- WorldCat Identities ID: https://worldcat.org/identities/lccn-n88208206
- Library of Congress authority ID: https://id.loc.gov/authorities/names/n88208206