List of legendary creatures (O)

  1. Obake (Japanese) – Shapeshifting spirits
  2. Obariyon (Japanese) – Spook which rides piggyback on a human victim and becomes unbearably heavy
  3. Obayifo (Ashanti) – Vampiric possession spirit
  4. Obia (West Africa) – Gigantic animal that serves witches
  5. Oceanid (Greek) – Nymph daughters of Oceanus
  6. Odei (Basque) – Storm spirit
  7. Odin (Norse mythology) – King of Asgard
  8. Odmience (Slavic) – Changeling
  9. Og (Jewish) – Giant king of the Amorites
  10. Ogopogo (Canadian) Canadian Lake Monster
  11. Ogun (Nigeria) – Iron god for the Yoruba people (South Western Nigeria)
  12. Ogre (Medieval folklore) – Large, grotesque humanoid
  13. Oiwa (Japanese) – Ghost of a woman with a distorted face who was murdered by her husband
  14. Ojáncanu (Cantabrian) – Giant cyclops who embodies evil.
  15. Ōkami (Japanese) – Spirit wolf of powerful
  16. Okiku (Japanese) – Spirit of a plate-counting servant girl, associated with the "Okiku-Mushi" worm
  17. Öksökö (Yakut/Dolgan) – Two or three-headed eagle
  18. Ōkubi (Japanese) – Death spirit
  19. Okuri-inu (Japanese) – Dog or wolf that follows travelers at night, similar to the Black dog of English folklore
  20. Ole-Higue (Guyanese) – Vampiric hag who takes the form of a fireball at night
  21. Ōmukade (Japanese) – Giant, human-eating centipede that lives in the mountains
  22. Oni (Japanese) – Large, grotesque humanoid demon, usually having red skin and horns
  23. Onibi (Japanese) – Spectral fire
  24. Onikuma (Japanese) – Bear monster with enormous strength that walks upright
  25. Onmoraki (Japanese) – Bird-demon created from the spirits of freshly dead corpses
  26. Onocentaur (Medieval Bestiaries) – Human-donkey hybrid
  27. Onoskelis (Greek) – Shapeshifting demon
  28. Onryō (Japanese) – Vengeful ghost that manifests in a physical rather than a spectral form
  29. Onza (Aztec and Latin American folklore) – Wild cat, possibly a subspecies of cougar
  30. Oozlum bird (Unknown origin) – Bird that flies backwards
  31. Ophiotaurus (Greek) – Bull-serpent hybrid
  32. Opinicus (Heraldic) – Lion-eagle hybrid, similar to a griffin, but with leonine forelimbs
  33. Opiyel Guabiron (Taíno) – A dog-shaped god that watched over the dead
  34. Orang Bunian (Malay) – Forest spirit
  35. Orang Minyak (Malay) – Spectral rapist
  36. Ördög (Hungarian) – Shapeshifting demon
  37. Oread (Greek) – Mountain nymph
  38. Ork (Tyrolean) – Little people and house spirits
  39. Orobas (European) – Horse-headed, honest oracle classed as a demon
  40. Orphan Bird (Medieval Bestiaries) – Peacock-eagle-swan-crane hybrid
  41. Orthrus (Greek) – Two-headed dog
  42. Osiris (Hellenized) – God of the dead and the judge of the underworld
  43. Oshun (Nigeria) – God of love and fertility
  44. Otso (Finnish) – Bear spirit
  45. Ouroboros (Worldwide) – Mystic serpent/dragon that eats its own tail
  46. Ovinnik (Slavic) – Malevolent threshing house spirit
  47. Owlman (Cornish) – Owl-like humanoid