| Abbreviation | Definition |
|---|---|
| OSRS | Office of Student Research and Scholarship |
| OSS | Overseas Student Services |
| OSSA | Office for Student Success and Advising |
| OSSA | Office of Scholarships and Student Aid |
| OSSA | Online Student Success Adviser |
| OSSI | Office of Student Success Innovations |
| OSSP | Office of Student Service and Placement |
| OSSP | Oregon State Student Pharmacists |
| OSSR | Online Student Schedule Request |
| OSTA | Oberlin Student Theater Association |
| OSTN | Open Student Television Network |
| OSV | Office of Student Volunteerism |
| OTSS | Office of Transfer Student Services |
| OTSS | Online Trust Student Survey |
| OTSS | Ontario Trust for Student Support |
| OTZ | Omega Tau Zeta |
| OUS | Office for Undergraduate Students |
| OUSU | Oklahoma University Students Union |
| OVRC | Opposing Viewpoints Resource Center |
| PAACH | Pan-Asian American Community House |