| USL | Ultimate Stealth Light 
| Others |
| USL | Ultra Soft Leather
| Others |
| USL | Ultra Stereo Labs
| Others |
| USL | Ultra Stereo Labs, Inc.
| Others |
| USL | Under Slung Load
| Others |
| USL | Unidata Software Library
| Others |
| USL | Uniform Shipping Laws (Australia)
| Others |
| USL | Uniform Speed Limit
| Others |
| USL | Unit Slope Line
| Others |
| USL | United Soccer League
| Others |
| USL | United Soccer Leagues
| Others |
| USL | United Spirits Limited
| Others |
| USL | United State of Laghman
| Others |
| USL | United States Lab
| Others |
| USL | Universal Scalability Law
| Others |
| USL | Universal Spatial Locator
| Others |
| USL | Universal Static Line
| Others |
| USL | Universal Systems Language
| Others |
| USL | University of Slow Learners
| Others |
| USL | University of Southwestern Louisiana
| Others |
| USL | University School of the Lowcountry
| Others |
| USL | Unix Software Laboratory
| Others |
| USL | Unix System Laboratories
| Others |
| USL | Update Service Locations
| Others |
| USL | Update Status Line
| Others |
| USL | Upper Specific Limit
| Others |
| USL | Upper Specification Limit
| Others |
| USL | Upper Statistical Limit
| Others |
| USL | Upper Support Limit
| Others |
| USL | Useless Loop, Western Australia, Australia
| Others |
| USL | User Subprogram Library
| Others |