Sigmund Jähn
- Birthday: 2/13/1937
- Deathday: 9/21/2019
- Place of birth: Morgenröthe-Rautenkranz, Saxony, German Reich
- Fame for: Acting
Biography
Sigmund Werner Paul Jähn (13 February 1937 – 21 September 2019) was a German cosmonaut and pilot who in 1978 became the first German to fly into space as part of the Soviet Union's Interkosmos programme.