Ernst Haeckel (1834–1919) was a German zoologist.
Haeckel or Häckel may also refer to:
People Anton Haeckl (), Austrian musical instrument builder Ernst Haeckel (general) (1890–1967), German general František Häckel, Czech cross-country skier Stephan H. Haeckel (born 1936), American management theorist
Science 12323 Haeckel, a minor planet named after Ernst Haeckel Haeckelites, family of hypothetical carbon allotropes
Biology Haeckelia, a genus of ctenophores in the family in the order Cydippida Haeckel's law, a version of the recapitulation theory in biology
Other uses Ernst-Haeckel-Haus, building in Jena, Germany Haeckel Peak, mountain in New Zealand Mount Haeckel, mountain summit in northern California, United States
See also
Hackel Hackl Haeckel's Tale