| Abbreviation | Definition |
|---|---|
| OPC | Online Parish Clerk |
| OPD | Occupational Property Databank |
| OPE | Oshkosh Placement Exchange |
| OPEB | Other Post Employment Benefits |
| OPEB | Other Post-Employment Benefit |
| OPEB | Other Post-retirement Employee Benefits |
| OPECC | Outpatient Pharmacy Electronic Claims Coordinator |
| OPH | Ophthalmologist |
| OPL | Old Pushy Liturgist |
| OPPM | Occupational Performance Process Model |
| OPQ | Occupational Personality Questionnaire |
| OPS | Outstanding Performance Series |
| OPSVA | One-Pipe Steam Valve Assembly |
| OPVI | OptiView Fiber Inspector |
| OPW | Oregon Peaceworker |
| OQR | Office of the Quartet Representative |
| OQW | One Quarter Worker |
| ORA | Operations Research Analyst |
| ORA | Organizational Research Analyst |
| ORCA | Occupational Researcher's Computer Assistant |