Look up echidna in Wiktionary, the free dictionary.
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