Organizations
- Oxford University Press (OUP) Publisher
- OSA Publisher
- Oxford University Press Publisher
- Ohio Northern University Law Review Publisher
- Oklahoma State University - (Stillwater, Oklahoma, United States) Organization,External Organization
- Ohio University - (Athens, Ohio, United States) External Organization
- OUP Oxford Publisher
- Optical Society of America Publisher
- Oceanography Academic Department,Organization
- Ocean Engineering Academic Department,Organization
- Okayama University - (Okayama, Okayama, Japan) External Organization
- OTC Publisher
- Oklahoma City University School of Law Publisher
- Our Lady of the Lake University - (San Antonio, Texas, United States) External Organization
- Oxford University Press, USA Publisher
- Oklahoma Christian University - (Edmond, Oklahoma, United States) External Organization
- Office of the Provost and Executive Vice President Administrative Unit,Organization
- Oxford University Press, Inc. Publisher
- Oregon State University - (Corvallis, Oregon, United States) Organization,External Organization
- Oxford University Press (UK) Publisher
- Orthodontics Academic Department,Organization