| Abbreviation | Definition |
|---|---|
| OSEC | Ocean Systems Engineering Corp |
| OSF | Open Source Folks |
| OSFC | Odisha State Financial Corporation |
| OSFC | Orissa State Financial Corporation |
| OSFC | Orthopaedic Spine & Fracture Clinic |
| OSG | Outsourcing Services Group |
| OSGC | Oneida Seven Generations Corporation |
| OSH | Orchard Supply Hardware |
| OSH | Orchard Supply home Hardware store |
| OSI | Ocean Specialists Inc |
| OSI | Office Solutions Inc |
| OSI | Officine Stampaggi Industriale |
| OSI | Origin Systems Inc |
| OSI | Origin Systems, Inc. |
| OSI | Origin Systems, Incorporated |
| OSI | Orthopedic Surgeons Inc |
| OSI | Sealants Inc |
| OSI | Systems Inc |
| OSIR | Osiris Therapeutics, Inc. |
| OSM | Ohana Seafood Market |