| Abbreviation | Definition |
|---|---|
| OAP(CDER) | Office of Antimicrobial Products (CDER) |
| OARSA | Office of Applied Research and Safety Assessment |
| OARSA(CFSAN) | Office of Applied Research and Safety Assessment (CFSAN) |
| OASDI | Old Age, Survivors, and Disability Insurance |
| OASH | Office of the Assistant Secretary for Health |
| OASIS | Operational and Administrative System for Import Support |
| OASIS | Outcome and Assessment Information Set |
| OB | Office of Biostatistics |
| OB | Orange Book (Approved Drug Products with Therapeutic Equivalence Evaluations) |
| OB(CDER) | Office of Biostatistics (CDER) |
| OBA | Office of Biotechnology Activities |
| OBE | On-line Booking Engine |
| OBE(CBER) | Office of Biostatistics and Epidemiology (CBER) |
| OBES(OC) | Office of Business Enterprise Solutions (OC) |
| OBFP(OC) | Office of Budget Formulation and Presentation (OC) |
| OB-GYN | obstetrics-gynecology |
| OBI | Office of Business Informatics |
| OBP(CDER) | Office of Biotechnology Products (CDER) |
| OBPS | Office of Business Process Support |
| OBPS(CDER) | Office of Business Process Support (CDER) |