| Abbreviation | Definition |
|---|---|
| OFT | Office of Fair Trading |
| OFTA | United States - Oman Free Trade Agreement |
| OGR | Office of Government Relations |
| OGT | Overseas General Trading |
| OLI | Ownership, Location, and Internationalization |
| OMC | Office of Munitions Control |
| ONAB | Observatoire National des Anomalies Bovines |
| ONAF | Onafhankelijk |
| OOFT | Office Of Fair Trade |
| OPCO | Onondaga Pottery Company |
| OPIC | Overseas Private Investment Corporation |
| OSS | Office of Strategic Services |
| OSS | Organization of Super Spies Rhymes with 'boss'not 'Office of Strategic Services', circa WW-TWO! |
| OSV | Offshore Supply Vessel |
| OSV | OutSource Vendor |
| OTCEI | Over-The-Counter Exchange of India |
| OTCG | Offshore Transmission Coordination Group |
| OTSS | Overseas Trade Support for SMEs |
| OUS | Outside United States |
| OWTG | Tienda para toda necesidad, confiable y segura |