Jahn (Jähn) is a surname, and may refer to:
- Erich Jahn (1907– ?), Hitler Youth leader
- Friedrich Ludwig Jahn (1778–1852), German educator
- Gunnar Jahn (1883–1971), Norwegian politician and resistance member
- Gunter Jahn (1910–1992), German U-boat commander
- Helmut Jahn (1940–), German-American architect
- Hermann Arthur Jahn (1907–1979), British scientist
- Jan Jahn (1739–1802), Czech painter and art historian
- Jeff Jahn (1970–), American artist and critic
- Johann Jahn (1750–1816), German Orientalist
- Kurt Jahn (1892–1966), German general
- Martin Jahn (1970–), Czech economist and politician
- Joseph Michael Jahn (born 1943), American author and critic
- Oliver Jahn, German film director, screenwriter, producer and actor
- Otto Jahn (1813–1869), German archaeologist, philologist, and writer on art and music
- Robert G. Jahn (1930–), American scientist, electrical engineer, and psychic investigator
- Ryan David Jahn (born 1979), American novelist and screenwriter
- Sigmund Jähn (born 1937), German astronaut
- Thomas Jahn (1965–), German film and television director
- Wilhelm Jahn (1835–1900), Austro-Hungarian orchestral conductor
- Wilhelm Jahn (athlete) (1889-1973), German athlete, Youth Movement Leader, Folk Song Composer, Publisher, WWII Officer
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