| Acronym | Meaning |
 | UICP | Uniform Inventory Control Program |
| UID | User Identification |
| UIL | Upper Interval Limit |
| UIP | UCAR Intellectual Property |
| UIPPA | See IUPAP |
| UK AEA | United Kingdom Atmomic Energy Authority |
| UKAERE | United Kingdom Atomic Energy Research Establishment |
| UKMO | United Kingdom Meteorological Office |
| ULAFOS | UCAR And Lower Atmospheric Facilities Oversight Section |
| ULTRIX | UNIX-based Operating System For Digital Equipment Corporation Computers |
| UM | University Of Michigan |
| UMASS | University Of Massachusetts |
| UMC | UCAR Managment Committee |
| UMF | User Master File |
| UMIST | University Of Manchester Institute Of Science And Technology |
| UMP | Upper Mantle Project |
| UN | United Nations |
| UNAM | Universidad Autonoma De Mexico |
| UNAVCO | University NAVSTAR [not An Acronym] Consortium |
| UNCED | United Nations Conference On Environment And Development |
| UNCHE OR UNCHE | United Nations Conference On The Human Environment |
| UNCOQ | Unaccompanied NonCommissioned Officers' Quarters |
| UND | University Of North Dakota |
| UNEP | United Nations Environment Programme |
| UNESCO | United Nations Educational |
| UNICOS | Unix Cray Operating System |
| UNIDATA | UNIDATA Program Center |
| UNIDATA | University Data Interactive Computing And Communications Systems |
| UNIX | A Computer Operating System Developed By AT&T And Modified Extensively By The University Of California At Berkeley |
| UNOLS | University-National Oceanographic Laboratory System |
| UNU | United Nations University |
| UOM | Upper-ocean Model |
| UOP | UCAR Office Of Programs |
| UOQ | Unaccompanied Officers' Quarters |
| UPC | Unidata Program Center |
| UPO | UCAR Projects Office |
| UPS | Uninterruptible Power Supply |
| UQAM | Universite De Quebec A Montreal |
| URC | University Relations Committee |
| URIP | University Research Initiative Program |
| URL | Universal Resource Locter |
| URSI | International Union Of Radio Science |
| USA | United States Army |
| USACE | United State Army Corps Of Engineers |
| USAF | United States Air Force |
| USAFGL | United States Air Force Geophysical Laboratory |
| USAN | University Satellite Accessed Network |
| USAP | United States Antarctic Program |
| USARP | United States Antarctic Research Program |
| USC-GARP | United States Committee For GARP |
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