| Abbreviation | Definition |
|---|---|
| OFS | Office of Financial Systems |
| OFU | Official Fanfiction University |
| OGA | Outwood Grange Academy |
| OGB | Old Gold and Black (Wake Forest University) |
| OGC | Office of the General Counsel |
| OGE | Office of Generalist Education |
| OGS | Office of Graduate Studies |
| OGU | Osaka Gakuin University |
| OGX | Out-Going Exchange Program |
| OHA | Oklahoma Health Academy |
| OHE | Office of Higher Education |
| OHR | Office of Human Resources |
| OHSU | Oregon Health Science University |
| OHSU | Oregon Health & Science University |
| OHSU | Oregon Health and Science University |
| OHSU | Oregon Health and Sciences University |
| OHSU | Oregon Health Science University |
| OHSU | Oregon Health Sciences University |
| OHU | Occupational Health University |
| OHU | OHio University (non-standard, usually OU) |