| OSI | A Organization For Standards Institute 
| Others |
| OSI | Ocean Specialists Inc
| Others |
| OSI | Ocean Star International
| Others |
| OSI | Office Of Scientific Information
| Others |
| OSI | Office of Scientific Investigation
| Others |
| OSI | Office Of Special Investigation
| Others |
| OSI | Office of Special Investigations
| Others |
| OSI | Office Of Strategic Influence
| Others |
| OSI | Office of Strategic Initiatives
| Others |
| OSI | Office Of Strategic Intelligence
| Others |
| OSI | Office of Student Involvement
| Others |
| OSI | Office of Superintendent of Insurance
| Others |
| OSI | Office Of Supernatural Investigation
| Others |
| OSI | Office of Systems Integration
| Others |
| OSI | Office Solutions Inc
| Others |
| OSI | Officina Stampaggi Industriali
| Others |
| OSI | Officine Stampaggi Industriale
| Others |
| OSI | Oil Stability Index
| Others |
| OSI | Online Search Interest
| Others |
| OSI | Only Safe Internet
| Others |
| OSI | Only Some Interest
| Others |
| OSI | Open Scholarship Initiative
| Others |
| OSI | Open Society Institute
| Others |
| OSI | Open Solver Interface
| Others |
| OSI | Open Source India
| Others |
| OSI | Open Source Indicators
| Others |
| OSI | Open Source Initiative
| Others |
| OSI | Open Source Institute
| Others |
| OSI | Open Space Institute
| Others |
| OSI | Open System Inter
| Others |
| OSI | Open System Interconnection
| Others |
| OSI | Open System Interface
| Others |
| OSI | Open Systematic Information
| Others |
| OSI | Open Systems Interconnect
| Others |
| OSI | Open Systems Interconnection
| Others |
| OSI | Open Systems International
| Others |
| OSI | Operating System Instance
| Others |
| OSI | Operating System Intelligence
| Others |
| OSI | Operation Serve International
| Others |
| OSI | Operational Subsystem Interface
| Others |
| OSI | Optimal System Integration
| Others |
| OSI | Option Symbology Initiative
| Others |
| OSI | Orchestra Of Strategic Influence
| Others |
| OSI | Ordinary Stuffed Isotopes
| Others |
| OSI | Ordnance Survey Ireland
| Others |
| OSI | Oregon Screen Impressions
| Others |
| OSI | Origin Systems Inc
| Others |
| OSI | Origin Systems, Incorporated
| Others |
| OSI | Orthopaedic Specialty Institute
| Others |
| OSI | Orthopedic Surgeons Inc
| Others |
| OSI | Other Significant Information
| Others |
| OSI | Overflow Stack Immediate
| Others |
| OSI | Oxford Sciences Innovation
| Others |
| OSI | Sealants Inc
| Others |
| OSI | The Overall Satisfaction Index
| Others |