| Abbreviation | Definition |
|---|---|
| OAL | Office of Administrative Litigation |
| OAP | Old Age Person |
| OAPCA | Olympic Air Pollution Control Authority |
| OAR | Offender Aid And Restoration |
| OARA | Oklahoma Antitrust Reform Act |
| OASIS | Old Age Social and Income Security |
| OATH | Office of Administrative Trials and Hearings |
| OATS | Oral Anecdotes And Testamentary Stories |
| OBA | Oklahoma Bar Association |
| OBA | Oxygen Breathing Apparatus |
| OBJ | Objection |
| OBRA | Omnibus Budget Reconciliation Act of 1981 |
| OBS | Oriental Blank Stare |
| OBT | Orgain, Bell, Tucker, L.L.P. |
| OBTS | Offender Based Tracking System |
| OBV | OBVious |
| OC | Organized Clan |
| OC | Organized Crime |
| OCA | Office of Court Administration |
| OCA | Originating Case Agency Number |