Ammann can mean:
- an alternative spelling of the Jordanian capital Amman
- an alternative spelling of amtmann or amman, an historical kind of bailiff
- a surname, as in :
- Erwin Ammann, a German politician and co-founder of the Christian Social Union of Bavaria (1916 – 2000)
- Jakob Ammann, a Swiss anabaptist leader and founder of the Amish (c. 1644 – c. 1730)
- Johann Conrad Ammann, Swiss physician and fossils collector (1724 – 1811)
- Johann Konrad Ammann, Swiss physician and instructor of deaf persons (1669 – 1724)
- Mike Ammann, American soccer player (born 1971)
- Othmar Ammann, structural engineer who built many of New York City's bridges (1879 – 1965)
- Robert Ammann, American amateur mathematician with contributions to aperiodic tilings (1946 – 1994)
- Simon Ammann, Swiss ski jumper (born 1981)
- Thomas Ammann, Swiss art dealer and collector (1950 – 1993)