| Abbreviation | Definition |
|---|---|
| OIS | Office of International Students |
| OISP | Office of International Students and Programs |
| OKU | Omicron Kappa Upsilon |
| OKZ | Omega Kappa Zeta |
| OLOS | Optimizing Learning Opportunities for Students |
| OLSA | Organizational Leadership Student Association |
| OMSA | Office of Medical Student Affairs |
| OMSA | Office of Minority Student Affairs |
| OMSA | Office of Multicultural Student Affairs |
| OMSA | Ontario Medical Students Association |
| OMSA | Otago Malaysian Students Association |
| OMSA | Otago Malaysian Students' Association |
| OMSE | Office of Medical Student Education |
| OMSE | Office of Multicultural Student Engagement |
| OMSN | Oman Medical Students Newsletter |
| ONDS | Office of Non Degree Students |
| ONS | Outstanding New Student |
| ONSA | Ohio Nursing Students Association |
| ONSP | Office Of New Student Programs |
| ONSP | Orientation And New Student Programs |