Author
- Obsequens, Julius 1
- Octavianus early 6th cent. 1
- Odo Saint, Abbot of Cluny ca. 879-942 1
- Odo, of Cheriton, d. 1247 1
- Oechaliae halosis 1
- Oedipodea 1
- Oenomaus 1
- Old Testament 53
- Olympichus Samius v3. Jh 1
- Olympiodorus, ca. 380-ca. 425 1
- Olympiodorus, the Younger, of Alexandria active 6th century 1
- Olympus 1
- Olympus Historicus 1. Jh. v. Chr. 1
- Onasander 1
- Onasimus Cyprius 3./4. Jh. n. Chr. 1
- Onomacritus 1
- Ophelio Comicus 4. Jh. v. Chr. 1
- Opilius, Aurelius, 1st cent. B.C. 1
- Oppian fl. 2nd cent 1
- Oppian of Apamea 1
