| Abbreviation | Definition |
|---|---|
| OHPA | Official Health Professions Advisor |
| OIC | Officer In Charge |
| OIM | Offshore Installation Manager |
| OIV | Open InVentor |
| OJE | Objective Job Evaluation |
| OJL | Oklahoma Job Link |
| OJM | On the Job Mentoring |
| OJN | Ohio JobNet |
| OK | Opportunity Knocks |
| OK | Organizational Knowledge |
| OLAF | Office européen de lutte antifraude (in French) European Anti-Fraud Office |
| OLD | Old Lady Driver |
| OLI | One Little Indian |
| OLK | Old Lighthouse Keeper |
| OLM | Ordained Local Minister |
| OM | Office Manager |
| OM | Officiating Minister |
| OM | Old Maid |
| OM | Operating Manager |
| OM | Operations Manager |