| UMA |
University Medical Associate |
| UMB |
Upper Memory Block (DOS) |
| UMB |
Upper Memory Block |
| UMCCC |
University of Michigan Comprehensive Cancer Center |
| UMDF |
User Mode Driver Fframework |
| UML |
Unified Modeling Language |
| UML |
Unified Modelling Language |
| UMNO |
United Malays National Organisation |
| UMR |
Unlock Machine Room |
| UMV |
User Mode Bus |
| UMWI |
Unprocessed Message Waiting Indicator |
| UN |
United Nations |
| UN-ESCAP |
United Nations Economic and Social Commission for Asia and the Pacific |
| UN-SNA |
United Nations System Of National Accounts |
| UNAC |
Upland NGO Assistance Committee |
| UNAEC |
United Nations Atomic Energy Commission |
| UNAMET |
United Nations Assistant Mission in East Timor |
| UNC |
Universal Naming Convention |
| UNCAFE |
United Nations Commission for Asia and the Far East |
| UNCBD |
United Nations Convention on Biological Diversity |
| UNCCD |
United Nations Convention to Combat Desertification |
| UNCED |
United Nations Conference on Environment and development |
| UNCHS |
United Nations Commission on Human Settlements |
| UNCHS |
United Nations Centre For Human Settlements |
| UNCIP |
United Nations Commission for India and Pakistan |
| UNCITRAL |
United Nations Conference on International Trade Law |
| UNCLOS |
United Nations Conference for New and Renewable Sources of Energy |
| UNCOD |
United Nations Conference on Desertfication |
| UNCSTD |
United Nations Conference on Science and Technology Development |
| UNCTAD |
united Nations Conference on Trade and Development |
| UNCV |
Ulnar Nerve Conduction Velocity |
| UNDARP |
United Socio-Economic Research Programme |
| UNDOF |
United Nations Disengagement |
| UNDP |
United Nations Development Programme |
| UNECE |
United Nations Economic Commission for Europe |
| UNEF |
United Nations Emergency Force |
| UNEP |
United Nations Environment Programme |
| UNESCO |
United Nations Educational Scientific and Cultural Organisation |
| UNESCO |
"United Nations Educational, Scientific and Cultural Organization" |
| UNFCCC |
United Nations Framework Convention on Climate Change |
| UNFPA |
United Nations Fund for Population Activities |
| UNFPA |
United Nations Population Fund |
| UNHCR |
United Nations High Commission for Refugees |
| UNHCR |
United Nations High Commissioner For Refugees |
| UNHRC |
United Nations Human Rights Commission |
| UNI |
United News of India |
| UNI |
Universal Nobel Institute |
| UNI |
Ente Nationale Italiano di Unificazione |
| UNIC |
United Nations Information Centre |
| UNICEF |
United Nations Children's Emergency Fund |