| Abbreviation | Definition |
|---|---|
| UCSF | Usual Community of Soviet Friends |
| UCT | Upper Confidence bounds applied to Trees |
| UD | Utility Dog |
| UDC | U Dumb Cluck! |
| UDO | Unendingly Deliberated Over |
| UDP | Unreliable Damn Protocol |
| UDP | Unreliable Datagram Packet |
| UDP | Unreliable Datagram Protocol |
| UE | Unified And Errogant |
| UEA | University Of Erotic Activities |
| UEFA | Unbelievably Easy For Arsenal |
| UF | Unique Fun |
| UF | University of Fairy tales |
| UF | University of Famous orange marmalade chefs |
| UF | University of Fantastic cupcakes |
| UF | University of Fargo north dakota |
| UF | University of Fernadina beach |
| UF | University of Fleamarkets |
| UF | University of Floor Sweepers |
| UF | University of Floral designers |