| Abbreviation | Definition |
|---|---|
| OS | Organizational Software |
| OS | Overhead Spending |
| OS | overstock(ed) |
| OSBI | Open Source Business Intelligence |
| OSC | Office Support Center |
| OSC | Online Service Center |
| OSC | Ontario Securities Commission |
| OSC | Operator Services Center |
| OSCAR | Objective, Subjective, Correlation, And Results |
| OSCAR | One Stop Centre for Advice and Resources |
| OSCAR | Online Survey Certification And Reporting |
| OSCAR | Outstanding Subsurface Contributions Achievements And Results |
| OSCI | Office of Service and Continuous Improvement |
| OSD | Original Schedule Date |
| OSF | Outsourcing Factory |
| OSG | Office of the Solicitor General |
| OSI | Operating System Intelligence |
| OSJ | Office of Supervisory Jurisdiction |
| OSO | Operating System Office |
| OSP | Online Solution Provider |