| Abbreviation | Definition |
|---|---|
| OSBI | Oklahoma State Bureau of Investigation |
| OSC | Office of State Controller |
| OSC | Organized Serial Crimes |
| OSCA | Office of the State Court Administrator |
| OSCOLA | Oxford Standard for the Citation Of Legal Authorities |
| OSE | Office of Support Enforcement |
| OSI | Office of Scientific Investigation |
| OSI | Office Of Supernatural Investigation |
| OSJ | Office of Social Justice |
| OSJ | Office of Supervisory Jurisdiction |
| OSJD | Office for Social Justice and Diversity |
| OSM | Officially Slightly Mad |
| OSP | Open Settlement Protocol |
| OSR | Own-Source Revenue(s) |
| OT | Original Transcription |
| OT | Other Torts |
| OTC | Offender Time Computation |
| OTC | Officers Training Conference |
| OTD | On The Docket |
| OTH | OTHer |