| Abbreviation | Definition |
|---|---|
| ONSS | Office of Nursing Student Success |
| OOPS | Organization Of Planning Students |
| OOSS | Organization for Ontario Secondary Students |
| OPIS | Organization of Public Interest Students |
| OPSA | Otago Polytechnic Students Association |
| OPSV | Otago Polytechnic Student Village |
| OPSW | Office of Physician and Student Wellness |
| OPTG | Ontario Postsecondary Transfer Guide |
| ORSL | Office of Residence and Student Life |
| OSA | Office of Student Affairs |
| OSA | Oregon Student Association |
| OSAB | OASIS Student Advisory Board |
| OSAC | Office of Student Affairs and Curriculum |
| OSAC | Oregon Student Access Commission |
| OSAC | Oregon Student Assistance Commission |
| OSAE | Oklahoma Student Art Exhibition |
| OSAI | Office of Student Access and Inclusion |
| OSAI | Office of Student Access Inclusion |
| OSAR | Office of Student Assistance and Relief |
| OSAS | Office Of Student Academic Services |