| Abbreviation | Definition |
|---|---|
| OSES | Oneonta State Emergency Squad |
| OSO | Operational Support Officer |
| OSP | Oregon State Police |
| OSPD | Ocean Springs Police Department |
| OSPD | Old Saybrook Police Department |
| OSPRE | Objective Structured Performance Related Examination |
| OSR | Ohio State Reformatory |
| OTD | Other Than Dwelling |
| OTIS | Offender Tracking and Information System |
| OTIS | Offender Tracking Information System |
| OTM | Other Than Mexican |
| OTP | On The Prowl |
| OTR | On The Run |
| OTW | Over-The-Wire |
| OVI | Operating a Vehicle while Intoxicated |
| OVRO | Overseas Visitors Records Office |
| OYA | On Your Ass |
| OYG | Original Young Gangsta |
| P.C. | Police Constable |
| P/T | Part-Time |