| Abbreviation | Definition |
|---|---|
| NZILA | New Zealand Insurance Law Association |
| NZLR | New Zealand Law Reports |
| NZSC | New Zealand Supreme Court |
| O | Obedience |
| O | Obedient |
| OAA | Of the Attorney Advisor |
| OAA | Older Americans Act |
| OAB | Ordem dos Advogados do Brasil (Brazilian Law Board) |
| OAB | Order of Attorneys of Brazil |
| OAC | Office of the Administrator for the Courts ( Washington) |
| OAC | Ohio Administrative Code |
| OACC | Office of Audits and Court Compliance |
| OACL | Our American Common Law |
| OACS | Ontario Association of Crime Stoppers |
| OAG | Office of Attorney General |
| OAG | Opinions of the Attorney General |
| OAH | Office of Administrative Hearings (Washington) |
| OAJ | Office of Administration of Justice |
| OAJ | Ohio Association for Justice |
| OAJ | Oklahoma Association for Justice |