| Abbreviation | Definition |
|---|---|
| OML | Osher Map Library |
| OMM | Olimpiada Mexicana de Matemáticas |
| OMP | Office of Marine Programs |
| OMQ | On-Line Motivation Questionnaire |
| OMS | Osteopathic Medical School |
| OMU | Ondokuz Mayis University |
| OMU | Online Manga University |
| ONEA | Organizacion Nacional de Estudiantes Ambientales y Carreras Afines |
| ONP | Online Neuropsychology Project |
| ONS | Office of Naval Science |
| ONU | Ohio Northern University |
| ONU | Olivet Nazarene University |
| OOA | Open Ocean Aquaculture |
| OOE | Optics and Opto- Electronics |
| OOSP | Office of Outreach and Special Populations |
| OOTD | Office Of The Dean |
| OOU | Olabisi Onabanjo University |
| OPA | Oral Proficiency Assessment |
| OPAC | Online Public Access Catalog |
| OPBDS | Department of Oral Pathology Biology and Diagnostic Sciences (University of Medicine & Dentistry of New Jersey) |