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Obake (Japanese) - Shapeshifting spirits
Obambo (Central African) - Homeless ghost
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
Oboro-guruma (Japanese) - Ghostly 牛车 with the face of its driver
Oceanid (Greek) - Nymph daughters of Oceanus
Odei (Basque) - Storm spirit
Odmience (Slavic) - Changeling
Og (Jewish) - Giant king of the Amorites
Ogre (Medieval folklore) - Large, grotesque humanoid
Ohaguro-bettari (Japanese) - Female ghost...