| Abbreviation | Definition |
|---|---|
| OSO(OC) | Office of Security Operations (OC) |
| OSP | Office of Suicide Prevention |
| OSS | Office of Shared Services |
| OSS(OC) | Office of Shared Services (OC) |
| OST | Office Services Team |
| OST(CFSAN) | Office Services Team (CFSAN) |
| OSTP | Office of Science and Technology Policy |
| OTC | Over-The-Counter |
| OTCDHFB | Over The Counter Drugs and Health Fraud Branch |
| OTCDHFB(CDER) | OTC Drugs and Health Fraud Branch (CDER) |
| OTCOM(CDER) | Office of Training and Communications (CDER) |
| OTFP | Other Than a Food Processing facility |
| OTR(CDER) | Office of Testing and Research (CDER) |
| OTRR(CBER) | Office of Therapeutics Research and Review (CBER) |
| OTS(CDER) | Office of Translational Sciences (CDER) |
| OVI | Organic Volatile Impurity |
| OVR | Operations Variance Report |
| OVRR | Office of Vaccines Research and Review |
| OVRR(CBER) | Office of Vaccines Research and Review (CBER) |
| OVST | Operations and Veterinary Support Team |