| UCD | Ultra Compact Dwarf 
| Others |
| UCD | Ultra Constant Discharge
| Others |
| UCD | Ultrasonic Coagulation Device
| Others |
| UCD | UML Class Diagram
| Others |
| UCD | Under Construction Daily
| Others |
| UCD | Underlying Cause of Death
| Others |
| UCD | Unemployment Compensation Disbursement
| Others |
| UCD | Unicode Character Database
| Others |
| UCD | Unified Content Descriptor
| Others |
| UCD | Uniform Call Distribution
| Others |
| UCD | Uniform Call Distributor
| Others |
| UCD | Uniform Closing Dataset
| Others |
| UCD | Uniform Constant Depth
| Others |
| UCD | Unique Core Differentiators
| Others |
| UCD | United Companion Dog
| Others |
| UCD | Univercity College Dublin
| Others |
| UCD | Universal Cable Descrambler
| Others |
| UCD | Universal Cd
| Others |
| UCD | Universal Class D
| Others |
| UCD | Universal Club Database
| Others |
| UCD | Universities Center at Dallas
| Others |
| UCD | University City District
| Others |
| UCD | University College Day
| Others |
| UCD | University College Dublin
| Others |
| UCD | University College Dublin's
| Others |
| UCD | University College, Dublin (Faculty of Veterinary Medicine)
| Others |
| UCD | University of California (at) Davis
| Others |
| UCD | University of California at Davis
| Others |
| UCD | University of California Davis
| Others |
| UCD | University of Colorado Denver
| Others |
| UCD | University of Cow Dung
| Others |
| UCD | Unstructured Cell Data
| Others |
| UCD | Upstream Channel Descriptor
| Others |
| UCD | Urea Cycle Disorder
| Others |
| UCD | Urine Collection Device
| Others |
| UCD | Use Case Diagram ( Prosa/OM)
| Others |
| UCD | Used Car Dealer
| Others |
| UCD | Used Car Department
| Others |
| UCD | User Centered Design
| Others |
| UCD | User Centred Design
| Others |
| UCD | User-Centered Design
| Others |
| UCD | Usual Childhood Diseases
| Others |
| UCD | Utilities Compact Disc
| Others |