| Acronym | Definition |
|---|
| UDP | User Datagram Protocol |
| UDP | Unitary Development Plan (statutory development plan for London and other metropolitan boroughs) |
| UDP | United Democratic Party |
| UDP | Universidad Diego Portales (Chilean university) |
| UDP | Universal Datagram Protocol (Cisco) |
| UDP | Uridine Diphosphate |
| UDP | Universal Driver Package |
| UDP | Underdrive Pulley (automotive) |
| UDP | Urban Design Plan (various locations) |
| UDP | Urban Development Planning |
| UDP | User Defined Primitive (computer programming) |
| UDP | Uridine Phosphorylase |
| UDP | Urban Design Project (Buffalo, NY) |
| UDP | Unit Deployment Program |
| UDP | USENET Death Penalty |
| UDP | Ulster Democratic Party |
| UDP | Unreliable Datagram Protocol |
| UDP | União Democrática Popular (Portuguese political party) |
| UDP | User Diagram Protocol |
| UDP | Urban Development Project |
| UDP | Unified Development Process (software development) |
| UDP | Unreliable Data Protocol |
| UDP | Ugly Duckling Presse |
| UDP | National Birth Party (Cyprus) |
| UDP | Urban Dispersion Program (US DHS) |
| UDP | Uridine 5'-Diphosphate |
| UDP | Ubuntu Documentation Project (computer project) |
| UDP | Union pour la Démocratie et le Progrès (French: Union for Democracy and Progress, Mauritania) |
| UDP | User-Defined Procedure |
| UDP | Undergraduate Degree Program |
| UDP | Up and Down Procedure |
| UDP | User Defined Process |
| UDP | Umpire Development Program (umpire evaluation process) |
| UDP | Unified Development Platform |
| UDP | Universal Dialing Plan |
| UDP | Unit Deployment Package |
| UDP | Unit Deployment Plan (US DoD) |
| UDP | Urbaine des Pétroles (French: Urban Petroleum; France) |
| UDP | Uniform Daylight Period |
| UDP | Up Down Pair (telecommunications) |
| UDP | Utility Deactivation Plan |