| Abbreviation | Definition |
|---|---|
| U&ES | Urea and Electrolytes |
| U.E.E. | Universal Elementary Education |
| U.E.E. | Universalization of Elementary Education |
| U.G.C. | University Grants Commission |
| U.K.G. | Upper Kinder Garten |
| U.P.E. | Universalization of Primary Education |
| U.P.S.C. | Union Public Service Commission |
| UA | University Australia |
| UA | Update Attribute |
| UA | Urine analysis |
| UA | Undergraduate Assistant |
| UA | Undercover Agent |
| UAA | Universal Audio Architecture |
| UAC | User Account Control |
| UAE | United Arab Emirates |
| UAGP | Universal Accelerated Graphics Port |
| UAN | Urea Ammonium Nitrate |
| UAO | Upper Airway Obstruction |
| UAP | User Account Protection |
| UAP | Unlicensed Assistive Personnel |
| UARS | Upper Atmosphere Research Satellite |
| UART | Universal Asynchronous Receiver/ Transmitter |
| UAS | Upstream Activator Sequence |
| UAS | Understanding of Alcoholism Scale |
| UAT | Universal Agriculture And Trade |
| UAV | Unmanned Aerial Vehicles |
| UAV's | Unmanned Arial Vehicles |
| UB | Unsigned Byte |
| UBLF | United Bengali Liberation Front |
| UBPA | University of Ballarat Publication Award |
| UBW | Usual Body Weight |
| UC | Upper Case |
| UC | Unreal Compile |
| UCAR | University Corporation for Atmospheric Research |
| UCE | Use Case Ends |
| UCITA | Uniform Computer Information Transaction Act |
| UD | Update Data |
| UD | Uterine Delivery |
| UDA | User Defined Attribute |
| UDC | Upper Division Clerk |
| UDC | User Defined Command |
| UDCR | Uni - Directional Cable Receiver |
| UDDI | "Universal Description, Discovery And Integration" |
| UDDI | Universal Description Discovery and Integration |
| UDF | User Defined Function |
| UDF | User Defined Format |
| UDF | Universal Disk Format |
| UDL | User Defined Language |
| UDMA | Ultra - Direct Memory Access |
| UDP | User Defined Procedure |