| OSO | Object Space Object 
| Others |
| OSO | Ocean Systems Operation
| Others |
| OSO | Odenwald School in Ober
| Others |
| OSO | Office of Satellite Operations
| Others |
| OSO | Office of Security Operations
| Others |
| OSO | Office of Signals Operations
| Others |
| OSO | Office of Systems Operations
| Others |
| OSO | Old South Offroad
| Others |
| OSO | Om Shanti Om
| Others |
| OSO | On Site Optimization
| Others |
| OSO | Online Sales and Operations
| Others |
| OSO | Online Science Olympiad
| Others |
| OSO | Onsala Space Observatory
| Others |
| OSO | Ontario Street Outlaws
| Others |
| OSO | Open Shift Origin
| Others |
| OSO | Open Source Objects
| Others |
| OSO | Open Source Only
| Others |
| OSO | Open Source Ortungssystem
| Others |
| OSO | Open Stack Orchestration
| Others |
| OSO | Operating System Office
| Others |
| OSO | Operational Support Office
| Others |
| OSO | Operational Support Officer
| Others |
| OSO | Orbiting Solar Observatory
| Others |
| OSO | Originating Screening Office
| Others |
| OSO | Originating Signaling Office
| Others |
| OSO | Other Significant Other
| Others |
| OSO | Other Significant Others
| Others |
| OSO | Our Special Ones
| Others |
| OSO | Outperform Stock Options
| Others |
| OSO | Over Scan Operation
| Others |
| OSO | Oxford Scholarship Online
| Others |