Echidna (disambiguation)
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Echidnas are Australian egg-laying mammals also known as spiny anteaters.
Echidna may also refer to:
- Echidna (mythology), monster in Greek mythology and namesake of the mammal
 - (42355) Typhon I Echidna, the natural satellite of the asteroid 42355 Typhon
 - ECHIDNA, high-resolution neutron powder diffractometer at Australia's research reactor OPAL
 - Echidna (Re:Zero), a character in the light novel series Re:Zero − Starting Life in Another World
 - Echidna, character in the video game The Bouncer
 - Echidna, a demoness in the video game Devil May Cry 4
 
Taxonomic genera
- Echidna (fish) J. R. Forster, 1788, a genus of moray eels
 - Echidna Cuvier, 1797, a junior homonym referring to the mammals commonly known as echidnas
 - Echidna Merrem, 1820, junior homonym for a genus of African snakes now treated as Bitis
 
See also
- Knuckles the Echidna, character from the Sonic the Hedgehog video game series
 - Echidna Parass, fictional character from the Black Cat series