Encyclopedias, Almanacs, Transcripts, and Maps
- Orlik, Emil
- Orlikow, David
- Orlinsky, Harry Meyer
- Orloff, Chana
- Ormian, ?ayyim
- Ormódy, Bertalan
- Ornest, Ota
- Ornitz, Samuel Badisch
- Ornstein, Abraham Frederick
- Ornstein, Jacob Meshullam ben Mordecai Ze'ev
- Ornstein, Leo
- Ornstein, Leonard Salomon
- Ornstein, Mordecai Ze'ev ben Moses
- Orobio de Castro, Isaac
- Orona Madrigal, Justino, St.
- Orosius, Paulus°
- Orot
- Orozco y Jiménez, Francisco
- Orozco, Alfonso de, Bl.
- Orpah