| Abbreviation | Definition |
|---|---|
| UND | Underground |
| UND | Urgency of Need Designator |
| UNDAC | United Nations Disaster Assessment and Coordination |
| UNDES | Unit Description |
| UNDHA | United Nations Department of Humanitarian Affairs |
| UN-DMT | United Nations Disaster Management Team |
| UNDP | United Nations Development Program |
| UNDPKO | UN Department for Peacekeeping Operations |
| UNDPKO | United Nations Department For Peacekeeping Operations |
| UNEF | United Nations Emergency Force |
| UNHCR | United Nations Office of The High Commissioner For Refugees |
| UNICOM | Universal Integrated Communications |
| UNIFIL | United Nations Interim Forces In Lebanon |
| UNIKOM | United Nations Iraq Kuwait Observer Mission |
| UNIL | Unclassified National Information Library |
| UNITAF | Unified Task Force |
| UNITREP | Unit Report |
| UNITREP | Unit Status and Identity Report |
| UNJLC | United Nations Joint Logistic Centre |
| UNK | Unknown |