| Underload | Space Science | UL |
| Ultra Latency | Computer Hardware | UL |
| Universal Locator | Softwares | UL |
| Ulaw Music File | File Type | UL |
| UnLucky | Internet Slang | UL |
| Unordered List | Computing | UL |
| Upper Left | Chemistry | UL |
| Using Linux | Media | UL |
| Underwriters Laboratories | Computer and Networking | UL |
| Used List | Law | UL |
| United Leaders | Organization | UL |
| Unexplored Land | Country Specific | UL |
| Ultra Loader | Military and Defence | UL |
| Urban Legend | Education | UL |
| University of Louisville | Organization | UL |
| Upper Limit | Space Science | UL |
| Universal Life | Local State | UL |
| Underwriters Laboratory | Medical | UL |
| Underwriters Laboratories, Inc. | Business Firm | UL |
| Unnumbered List | Computing | UL |
| Unilever PLC | NASDAQ Symbol | UL |
| Unwritten Law | Law | UL |
| Uplink | NASA | UL |
| United Laboratories | Business Firm | UL |
| Universal Library | Computing | UL |
| Upper lobe | Physiology | UL |
| Unión Liberal | Spanish | UL |
| University of Louisiana | University | UL |
| University of Limerick (Ireland) | University | UL |
| upload | Government | UL |
| Unit Level | Military | UL |
| Ultra Light | Transportation | UL |
| Unilever, PLC. | NYSE Symbol | UL |
| Utterly Lazy | Internet Slang | UL |
| University of Leiden | University | UL |
| Unsorted List | Computing | UL |
| Ultronix | Government Supplier | UL |
| United Lodge | Medical | UL |
| Unsigned Long | Computer Assembly | UL |
| Ultra Lite | Transportation | UL |
| Up Left | Softwares | UL |
| Up Link | Telecom | UL |
