| Acronym | Definition |
|---|
| UDI | Unique Device Identification (medical devices; US FDA) |
| UDI | Union des Démocrates et Indépendants (French: Union of Democrats and Independents) |
| UDI | Unión Demócrata Independiente (Spanish: Independent Democratic Union) |
| UDI | Unione Donne in Italia (Italian: Union of Italian Women) |
| UDI | Unilateral Declaration of Independence |
| UDI | Universal Debug Interface |
| UDI | Universal Digital Indicator |
| UDI | Unique Device Identifier |
| UDI | Unified Display Interface |
| UDI | User-Driven Innovation (product creation) |
| UDI | United Defense Industries, Inc. (stock symbol) |
| UDI | Urban Development Initiatives (various locations) |
| UDI | Unrestricted Digital Information |
| UDI | Under the Direct Influence |
| UDI | Utility Data Institute |
| UDI | Unidentified Drinking Injury |
| UDI | Usuário de Drogas Injetáveis (Portuguese) |
| UDI | Uniform Device Interface (Intel/Unix) |
| UDI | United Dairymen of Idaho |
| UDI | U-Drive-It |
| UDI | Unità di Documentazione e Informazione per la Ricerca Agraria |
| UDI | Unidad de Información (Spanish: Information Unit) |
| UDI | Unit Drill Instructor |
| UDI | Unique Data Item |
| UDI | Universal Digital Interface (television) |
| UDI | User-Defined Interface |
| UDI | Urban Development Institute of Canada |
| UDI | Unit Disciplinary Investicator (Canada) |