| Abbreviation | Definition |
|---|---|
| UCCCDSW | UNESCO Chair on Cyberspace & Culture: Dual Spacization of the World |
| UCMS | Unilateral Corrosive Measures |
| UDA | Ulster Defence Association |
| UDF | United Democratic Front in South Africa |
| UDP | Usurious Department Of Protocol |
| UE | Union Earth |
| UE | United Earth |
| UEG | United Earth Government |
| UEO | United Earth Organization |
| UFF | Ulster Freedom Fighters |
| UFT | Undersecretariat for Foreign Trade |
| UG | Universal Government |
| UGF | Under- Ground Facility |
| UI | Unofficial International |
| UIE | UNESCO Institute for Education |
| UKP | Unesco Klub Piran |
| ULFC | Uniform Law on the Formation of Contracts for the International Sale of Goods (UN convention) |
| ULIS | Uniform Law on the International Sale of Goods (1964; UN) |
| UMP | rban Management Programme |
| UMP | Urban Management Programme |