| Acronym | Definition |
|---|
| UDF | Universal Disk Format (Optical Storage Technology Association) |
| UDF | User Defined Functions |
| UDF | United Democratic Front (Malawi, Namibia) |
| UDF | Union pour La Démocratie Française (French: Union for French Democracy, political party) |
| UDF | Uncharted: Drake's Fortune (gaming) |
| UDF | United Development Funding (Grapevine, TX) |
| UDF | Universal Database File |
| UDF | Universal Disk Format |
| UDF | User Defined Function |
| UDF | Urban Design Framework (Australia) |
| UDF | Union of Democratic Forces (Bulgarian political party) |
| UDF | Underflow |
| UDF | United Dairy Farmers |
| UDF | User-Defined Field (SAP) |
| UDF | User Development Fee (India) |
| UDF | Ultra Deep Field |
| UDF | Union des Fabricants (French: Union Manufacturers) |
| UDF | Ultrafine Depth Filtration (South Africa) |
| UDF | Universal Data Format |
| UDF | Uniqueness Database File |
| UDF | User Defined Feature |
| UDF | Urban Direction Finding |
| UDF | Unit Development Folder |
| UDF | User Defined Format |
| UDF | Ulster Defence Force |
| UDF | User Data File |
| UDF | Un-Ducted Fan |
| UDF | Unit Data File |
| UDF | Urgent Detection Factor |
| UDF | UAV (Unmanned Aerospace Vehicle) Demonstration Flight (drones) |
| UDF | Urban Development Foundation (UK) |
