Acronym |
Definition |
| OECD | Organization for Economic Co-operation and Development |
| OEF | Operation Enduring Freedom |
| OESC | Office for ECOSOC Support and Coordination |
| OFC | Office |
| OFC | Occupancy Free of Charge |
| OFF | Oil For Food |
| OGA | On Good Authority |
| OHCHR | The Office of UN High Commissioner for Human Rights |
| OHQ | Operational HeadQuarters |
| OICT | Office of Information and Communications Technology |
| OIE | Office International des Epizooties |
| OIE | Office of International Education |
| OIE | World Organisation for Animal Health |
| OIH | Office of International Health |
| OIOS | Office of Internal Oversight Services |
| OLA | Office of Legal Affairs |
| OMUN | Ohio Model United Nations |
| OMUN | Ontario Model United Nations |
| OMUN | Oklahoma Model United Nations |
| OMUN | Online Model United Nations |
| ONU | Organización de las Naciones Unidas |
| ONU | Organizzazione delle Nazioni Unite |
| ONUCI | United Nations Operation in Côte d'Ivoire |
| ONUCI | Opération des Nations Unies en Côte d'Ivoire |
| OO | Official Observer |
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