Kleinmann is a common surname:
- Dieter Kleinmann (born 1953), German politician[1]
- Georges Kleinmann, a French journalist[2]
- Larissa Kleinmann (born 1978), German cyclist[3]
- Louis Théodore Kleinmann (1907–1979), a French officer[4]
- Ralf Kleinmann (born 1971, Cologne, Germany), a German-American football player[5]
- Wilhelm Otto Max Kleinmann (1876–1945), a German railway official and politician[6]
- Kleinmann's tortoise, Egyptian tortoise or Leith's tortoise (Testudo kleinmanni)