| Abbreviation | Definition |
|---|---|
| OCR | Open Court Reading |
| OCRA | of the Court Remote Access |
| OCRA | Officer of the Court Remote Access |
| OCRMS | Online Criminal Records Management System |
| OCSE | Office of Child Support Enforcement's |
| OCSH | Office of Child Support Hearings |
| OCTB | Organised Crime and Triad Bureau |
| OCTB | Organized Crime and Triad Bureau |
| OCTB | Organized Crime Triad Bureau |
| OCVE | Office of Commercial Vehicle Enforcement |
| ODA | Ontarians with Disabilities Act |
| ODAA | Oklahoma District Attorneys' Association |
| ODAA | Oregon District Attorney's Association |
| ODACC | Ontario Dispute Adjudication for Construction Contracts |
| ODARA | Ontario Domestic Assault Risk Assessment |
| ODBA | Old Dominion Bar Association |
| ODbL | Open Data Commons Open Database License |
| ODCE | Of the Director of Corporate Enforcement (Ireland) |
| ODCE | Owen Dixon Chambers East (legal chambers; Australia) |
| ODD | Oppositional Defiant Disorder |