| Abbreviation | Definition |
|---|---|
| UND | Uluslararas1 Nakliyeciler Derne i |
| UND | Uluslararasi Nakliyeciler Dernegi |
| UNDC | United Nations Development Corporation |
| UNDC | Universal Network Development Corporation |
| UNDC | Urban Neighborhood Development Corporation |
| UNE | Unified Network Elements |
| UNI | Union Network International |
| UNIQLO | UNIQue CLOthing Warehouse |
| UnLtd | Unstoppable LTD |
| UNM | United Business Media, PLC. |
| UNM | Unvale New Media Solutions |
| UNO | United Online |
| UNOC | Uganda National Oil Company |
| UNSC | United Nation Space Corp |
| UNSI | United Network Services Inc |
| UNTL | United Nigerian Textiles Ltd |
| UNTR | United Tractors |
| UNX | Universal Network Exchange |
| UO | Ultima Online |
| UOA | United Oriental Assurance, Bhd |