List of legendary creatures (O)
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- Obake (Japanese) - Shapeshifting spirits
- Obariyon (Japanese) - Spook which rides piggyback on a human victim and becomes unbearably heavy
- Obayifo (Ashanti) - Vampiric possession spirit
- Obia (West Africa) - Gigantic animal that serves witches
- Oceanid (Greek) - Nymph daughters of Oceanus
- Odei (Basque) - Storm spirit
- Odmience (Slavic) - Changeling
- Og (Jewish) - Giant king of the Amorites
- Ogun (Nigeria) - god of Iron for the Yoruba people (South Western Nigeria)
- Ogre (Medieval folklore) - Large, grotesque humanoid
- Oiwa (Japanese) - Ghost of a woman with a distorted face who was murdered by her husband
- Ojáncanu (Cantabrian) - Giant cyclops who embodies evil.
- Okiku (Japanese) - Spirit of a plate-counting servant girl, associated with the "Okiku-Mushi" worm
- Ōkubi (Japanese) - Death spirit
- Okuri-inu (Japanese) - Dog or wolf that follows travelers at night. Similar to the Black dog of English folklore
- Ole-Higue (Guyanese) - Vampiric hag who takes the form of a fireball at night
- Ōmukade (Japanese) - Giant, human-eating centipede that lives in the mountains
- Oni (Japanese) - Large, grotesque humanoid demon, usual having red skin and horns
- Onibi (Japanese) - Spectral fire
- Onmoraki (Japanese) - Bird-demon created from the spirits of freshly dead corpses
- Onocentaur (Medieval Bestiaries) - Human-donkey hybrid
- Onoskelis (Greek) - Shapeshifting demon
- Onryō (Japanese) - Vengeful ghost that manifests in a physical rather than a spectral form
- Onza (Aztec and Latin American folklore) - Wild cat, possibly a subspecies of cougar
- Oozlum bird (Unknown origin) - Bird that flies backwards
- Ophiotaurus (Greek) - Bull-serpent hybrid
- Opinicus (Heraldic) - Lion-eagle hybrid, similar to a griffin, but with leonine forelimbs
- Orang Bunian (Malay) - Forest spirit
- Orang Minyak (Malay) - Spectral rapist
- Ördög (Hungarian) - Shapeshifting demon
- Oread (Greek) - Mountain nymph
- Ork (Tyrolean) - Little people and house spirits
- Orobas (European) - Horse-headed, honest oracle classed as a demon
- Orphan Bird (Medieval Bestiaries) - Peacock-eagle-swan-crane hybrid
- Orthrus (Greek) - Two-headed dog
- Osiris (Hellenized) - god of the dead and the judge of the underworld
- Oshun (Nigeria) - god of love and fertility
- Otso (Finnish) - Bear spirit
- Ouroboros (Worldwide) - Mystic serpent/dragon that eats its own tail
- Ovinnik (Slavic) - Malevolent threshing house spirit
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