Organizations
- Occidental College - (Los Angeles, California, United States) External Organization
- Our Lady of the Lake University - (San Antonio, Texas, United States) External Organization
- Oklahoma City University School of Law Publisher
- Oklahoma City University Law Review Publisher
- Ohio State Journal of Criminal Law Publisher
- Open Library of the Humanities Publisher
- Oregon Review of International Law Publisher
- Ohio State Law Journal Publisher
- Ohio Northern University Law Review Publisher
- Oklahoma Law Review Publisher
- Oregon Law Review Publisher
- Oxford Library of Psychology Publisher
- owman & Littlefield Publisher
- Open Science Publishers LLP Publisher
- Ocimum Scientific Publishers Pty Ltd Publisher