This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Ogre (Medieval folklore)
An ogre (feminine: ogress) is a legendary monster depicted as a large, hideous, man-like being that eats ordinary human beings, especially infants and children.[1] Ogres frequently feature in mythology, folklore, and fiction throughout the world. They appear in many classic works of literature, and are most often associated in fairy tales and legend.
In mythology, ogres are often depicted as inhumanly large, tall, and having a disproportionately large head, abundant hair, unusually colored skin, a voracious appetite, and a strong body. Ogres are closely linked with giants and with human cannibals in mythology. In both folklore and fiction, giants are often given ogrish traits (such as the giants in "Jack and the Beanstalk".