Encyclopedias, Almanacs, Transcripts, and Maps
- Osipovich, Nahum
- Osiris, Daniel Illfa
- Osmund of Salisbury, St.
- Osnabrueck
- Osoblaha
- Osrhoene
- Osroene
- Ossó y Cervelló, Enrique (Henry) de, St.
- Ossowetzky, O. Yehoshua
- Ossuaries
- Ossuaries and Sarcophagi
- Ostfeld, Barbara Jean
- Ostraca
- Ostracon
- Ostriker, Alicia
- Ostrog
- Ostrogorski, Moses
- Ostroleka
- Ostrolenk, Bernhard
- Ostropoler, Hershele