| Acronym | Definition |
|---|
| UDB | Universal Database (IBM) |
| UDB | Urban Development Boundary |
| UDB | Uniqueness Data Base |
| UDB | Universal Data Base |
| UDB | User Data Base |
| UDB | Ultimate Data Base |
| UDB | Update Data Base |
| UDB | Unquiet Data Base |
| UDB | User Behavioral Database |
| UDB | Union Démocratique Bretonne (French: Breton Democratic Union; political party; France) |
| UDB | Universal Desktop Box (computing) |
| UDB | Update Buffer |
| UDB | Unified Data Base |
| UDB | Union des Designers de Belgique (French: Union of Designers of Belgium) |
| UDB | Uprava Drzavne Bezbednosti (State Security Committee, Yugoslav) |