| Acronym | Definition |
|---|
| UDD | United Front for Democracy Against Dictatorship (Thailand) |
| UDD | Universidad del Desarrollo (Chile) |
| UDD | User-Defined Database |
| UDD | User-Driven Development |
| UDD | Unix to Unix Decoder |
| UDD | Unmanaged Device Discovery |
| UDD | User Diagnostics Disk |
| UDD | Ultra Digidrive |
| UDD | Universal Disk Drive |
| UDD | User Data Document |
| UDD | Unit Dose Dispensing |
| UDD | Unpaid Domestic Duties (marriage registries) |
| UDD | Union for Democracy and Development (Mali) |
| UDD | Up Dharma Down (band) |
| UDD | Underage Drinking and Driving |
| UDD | Uniform Distribution of Deaths (actuarial models) |
| UDD | Unconstrained Delay Data |
| UDD | Urine Diversion Dehydration (toilet) |
| UDD | Union Direkte Demokratie (German: Direct Democracy Union) |
| UDD | Urine Detection Device (Singapore) |
| UDD | Unidade de Derivação Digital |
| UDD | Universal Data Dictionary |
| UDD | Ultimate Daredevil (comic) |
| UDD | User Documentation Description |
| UDD | Underworld Death Dealers (World of Warcraft guild) |
| UDD | Un-Merged Decision Depth |
| UDD | Unified Development District |
| UDD | Utility Distribution Diagram |
| UDD | Unity Duty Destiny (Bionicle fan fiction) |
| UDD | Uhrig Dynamical Decoupling (physics) |
| UDD | Underwriting Decision Documentation (insurance) |