| Abbreviation | Definition |
|---|---|
| OHIO | Only Handle It Once |
| OHO | One Huge Opportunity |
| OHS | Occupational Health and Safety |
| OHSC | Occupational Health Smart Card |
| OHU | Occupational Health Unit |
| OI | Or Immediate |
| OI | Order Information |
| OI | Orders In |
| OIA | Office of Integrative Activities |
| OICV | Organisation Internationale des Commissions de Valeurs |
| OIGF | of the Inspector general Forests |
| OIGF | of the Inspector General of Forests |
| OIGI | Office of the Inspector General of Intelligence |
| OIM | Office of Information Management |
| OIM | Office of Investment Management |
| OIM | Online And Innovation Marketing |
| OIO | Office Inventory Ordering |
| OIS | Office Information System |
| OIS | Only In Spain |
| OJL | On-the-Job Learning |