| Abbreviation | Definition |
|---|---|
| OK | Zero Kills |
| OM | On Mushrooms |
| OOJ | Order Of Johns |
| OOS | Officer On Scene |
| OOV | Out Of Victims |
| OPA | Office of Police Accountability |
| OPB | Other Peoples' Babies |
| OPC | Order of Protective Custody |
| OPCC | Office of the Police Complaint Commissioner |
| OPCR | Office of Police Conduct Review |
| OPD | Oakland Police Department |
| OPD | Oakland Police Dept |
| OPD | Odessa Police Department |
| OPD | Omaha Police Department |
| OPD | Ontario Police Dept |
| OPD | Orlando Police |
| OPD | Orlando Police Department |
| OPD | Owensboro Police Department |
| OPG | Official Police Garage |
| OPG | Official Police Garages |