
- 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
 - Odin (Norse mythology) – King of Asgard
 - Odmience (Slavic) – Changeling
 - Og (Jewish) – Giant king of the Amorites
 - Ogopogo (Canadian) Canadian Lake Monster
 - Ogun (Nigeria) – Iron god 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, usually 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
 - Owlman (Cornish) – Owl-like humanoid
 
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