| Acronym | Definition |
|---|
| UL | Upload |
| UL | Urban Legend |
| UL | Underwriters Laboratories Incorporated |
| UL | Unlimited |
| UL | Up (Stage) Left |
| UL | University of Louisiana (Lafayette) |
| UL | Ulm (Germany) |
| UL | University of Limerick (Ireland) |
| UL | Universal Life (insurance) |
| UL | Upper Level |
| UL | Upper Limit (nutrition) |
| UL | Ulica (Russian, street; used in postal addresses) |
| UL | University Library |
| UL | University of Louisville (Kentucky) |
| UL | Uplink |
| UL | Unlucky (online poker) |
| UL | Underwriter Laboratories (various locations) |
| UL | Unilever (Europe) |
| UL | University of Lisbon (Portugal) |
| UL | Urban League |
| UL | University of London |
| UL | Unordered Lists (HTML) |
| UL | Université Laval (Québec) |
| UL | Until Later |
| UL | Un Lit |
| UL | University of Leeds (UK) |
| UL | Universal Language |
| UL | Tolerable Upper Intake Level (Institute of Medicine, maximum level of daily nutrient intake that is likely to pose no risk of adverse side effects) |
| UL | Ultralight Aircraft |
| UL | Univerza v Ljubljani (Slovenia) |
| UL | Unit Linked |
| UL | Upper Limb (anatomy) |
| UL | Unit Level |
| UL | Unit Load |
| UL | Unexpected Loss |
| UL | Unwritten Law (band) |
| UL | Ultra Linear |
| UL | University of Leiden (Netherlands) |
| UL | University of Lincoln (England) |
| UL | Untold Legends (PSP game) |
| UL | Uterine Leiomyoma |
| UL | Uniwersytet Lodzki |
| UL | University of Lowell (UK) |
| UL | Ultra-Latency |
| UL | Unità Lavorative |
| UL | Ultras Leverkusen (German football-team fan club) |
| UL | Universal Listener (early name for Microsoft Internet Information Services HTTP.SYS) |
| UL | Srilankan Airlines Code |
| UL | Unwritten Legend (gaming) |
| UL | Undying Legends (gaming group) |
| UL | Upper Lid of the Eye |
| UL | Ungerbock Labeling |