| Abbreviation | Definition |
|---|---|
| NMS | New Member States |
| NMUN | National Model United Nations |
| NMUN-DC | National Model United Nations - District of Columbia |
| NMUN-NY | National Model United Nations - New York |
| NOA | Notice Of Application |
| NOB | National Officer, level B |
| NPR | Nation Progress Report |
| NPR | National Prosperous Radio |
| NS | Narrative Summary |
| NSA | NATO Standardization Agency |
| NSAG | None State Armed Group |
| NUA | New Urban Agenda |
| OAPI | l'Organisation Africaine de la Propriété Intellectuelle (African Intellectual Property Organization) |
| OCHA | Office for Coordination of Humanitarian Affairs |
| ODA | Overseas Development Assistance |
| OESC | Office for ECOSOC Support and Coordination |
| OFC | Occupancy Free of Charge |
| OFF | Oil For Food |
| OHCHR | The Office of UN High Commissioner for Human Rights |
| OIE | Office International des Epizooties |