| Abbreviation | Definition |
|---|---|
| OSI | Office Of Special Investigation |
| OSL | Office of Student Life |
| OSLA | Oklahoma Student Loan Authority |
| OSP | Opportunity Scholars Program |
| OSR | Office for Sponsored Research |
| OSR | Office of Sponsored Research |
| OSR | Organization of Student Representatives |
| OSR | Outreach Student Representative |
| OSRS | Office of Sponsored Research Services (Texas A&M University System) |
| OSS | Office of Survey Systems |
| OSSD | Ottawa School of Speech and Drama |
| OSSS | Office of Student Support Services |
| OSU | Ohio State University |
| OSU | Ohio State University's |
| OSU | Oklahoma Second University |
| OSU | Oklahoma State University |
| OSU | Oklahoma State UniversityOklahoma State University |
| OSU | Oregon State University |
| OSU | Oregon State University's |
| OSU | Outstanding Satisfactory Unsatisfactory |