| Abbreviation | Definition |
|---|---|
| ULR | Uninsured Loss Recovery |
| ULS | Use Less Stuff |
| ULT. | Ultimo (meaning last month) |
| ULWC | Universal Living Wage Campaign |
| UM | Union Meeting |
| UMFCCI | Union of Myanmar Federation of Chambers of Commerce and Industry |
| UMFI | Upland Marketing Foundation, Inc. |
| UMITS | Unified Market Intelligence Tracking System |
| UML | Unified Modeling Language |
| UMO | Ultimate Mobile Office |
| UMP | Universal Management Paradigm |
| UMS | Useless Motivational Slogan |
| UMW | Utah Metal Works, Inc. |
| UNGA | U N General Assembly |
| UNGA | UN General Assembly |
| UNH | The University Of No Hardware |
| uninc. | unincorporated |
| UNITE | Union of Needletrades, Industrial, and Textile Employees |
| unk. | unknown |
| UNL | UNLimited |