| UDF | Excel User Defined Function 
| Others |
| UDF | Filter (Photostyler)
| Others |
| UDF | Photostyler Image Filter
| Others |
| UDF | The Universal Disk For
| Others |
| UDF | Ulster Defence Force
| Others |
| UDF | Ultimate Destruction Force
| Others |
| UDF | Ultra Deep Field
| Others |
| UDF | Un- Ducted Fan aircraft engine
| Others |
| UDF | Underworld Dust Funk
| Others |
| UDF | Underworld Dust Funk Unity Diversity Freedom
| Others |
| UDF | Unified Disc Format
| Others |
| UDF | Union of Democratic Forces
| Others |
| UDF | Uniqueness Database File
| Others |
| UDF | Uniqueness Database File (Windows NT)
| Others |
| UDF | Unit Data File
| Others |
| UDF | Unit Development Folder
| Others |
| UDF | United Dairy Farmers
| Others |
| UDF | United Democratic Federation
| Others |
| UDF | United Democratic Front
| Others |
| UDF | United Democratic Front in South Africa
| Others |
| UDF | United Development Funding
| Others |
| UDF | United Digital Forces
| Others |
| UDF | Univeral Disk Format
| Others |
| UDF | Universal Data File
| Others |
| UDF | Universal Data Format
| Others |
| UDF | Universal Database File
| Others |
| UDF | Universal Date Format
| Others |
| UDF | Universal Disc Format
| Others |
| UDF | Universal Disk Format
| Others |
| UDF | Universal Disk Formating
| Others |
| UDF | Universial Disk Format
| Others |
| UDF | University Dissertation Fellowships
| Others |
| UDF | Upper Document Feeder
| Others |
| UDF | Urban Direction Finding
| Others |
| UDF | User Data File
| Others |
| UDF | User Definable Function
| Others |
| UDF | User Defined Field
| Others |
| UDF | User Defined Format
| Others |
| UDF | User Defined Function
| Others |
| UDF | User Defined Functions
| Others |
| UDF | Utility and Data Flow
| Others |
| UDF | Windows NT Uniqueness Database File
| Others |