| Under Construction Daily | Transportation | UCD |
| Use Case Diagram ( Prosa/om) | File Type | UCD |
| Umbrella of the Capital District | Organization | UCD |
| Unión de Centro Democrático | Spanish | UCD |
| Uniform Call Distribution | Telecom | UCD |
| Upstream Channel Descriptor | Networking | UCD |
| University of California, Davis | Organization | UCD |
| Urine Collection Device | Physiology | UCD |
| Uniform Call Distributor | Telecommunication | UCD |
| University College Dublin | Educational Institute | UCD |
| Unstructured Cell Data | Database Management | UCD |
| University College, Dublin (Faculty of Veterinary Medicine) | Veterinary | UCD |
| Usual childhood diseases | Physiology | UCD |
| University of California at Davis | University | UCD |
| User Centered Design | Computing | UCD |
| Universal Cable Descrambler | Media | UCD |
| Use Case Diagram (Prosa/OM) | File Extension | UCD |
