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Haeckel or Häckel can refer to:
- Ernst Haeckel (1834–1919), German biologist, naturalist, philosopher, physician, professor and artist
- František Häckel, a Czechoslovakian cross country skier
- Stephan H. Haeckel, a management theorist who developed the idea of the sense-and-respond organization
- 12323 Haeckel, a minor planet named after Ernst Haeckel
- Haeckel's Law, a version of the Recapitulation theory in biology
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