| Abbreviation | Definition |
|---|---|
| OMS | Optical Manufacturing Solution |
| ONAN | Oil Natural Air Natural |
| ONTAP | Open Network Technology for Appliance Products |
| OOAK | One Of A Kind |
| OOD | Out Of Date |
| OOIP | Original Oil In Place |
| OOS | Out Of Stock |
| OOS | Out Of Style |
| OOSP | One and Only SPecial |
| OOTD | Offer Of The Day |
| OP | Office Products |
| OP | Oil Pan |
| OP | Over-Powered |
| OPA | Other Principle Arterial |
| OPAS | Off Power Assisted Steering |
| OPCM | Orthotropic Piezoelectric Composite Materials |
| OPD | Overfilling Prevention Device |
| OPEC | Organisation of Petroleum Exporting Countries |
| OPHD | Operational Property Help Desk |
| OPI | Opening Package Inspection |