| Abbreviation | Definition |
|---|---|
| URI | URinary Incontinence |
| URI | Uniform Resource Indicator |
| URICA | University of Rhode Island Change Assessment |
| URL | Uniform Resource Locator |
| URL | Underground Racing League |
| URL | Unfinanced Requirements List |
| URL | Universal Reader Line |
| URL | Under Rolling Lights |
| URL | User Really Lost |
| URO | University Radiation Oncology Associates |
| URPD | Undergraduate Research Program Director |
| URPE | Urban and Regional Planning Executive |
| URPI | Uro-Radiology Prostate Institute |
| URTI | Upper respiratory tract infection |
| US | Ultasound (scan) |
| USA | United States of America |
| USA | United Stockgrowers of America |
| USAID | United States Agency for International Development |
| USB | Universal Serial Bus |
| USB-IF | Usb Implementers Forum |
| USCC | United States Composting Council |
| USDA | United States Department of Agriculture |
| USFWS | United States Fish and Wildlife Service |
| USGCRP | United States Global Change Change Research Program |
| USGS | United States Geological Survey |
| USIS | United States Information Service |
| USLE | Universal Soil Loss Equation |
| USMARC | United States Machine Readable Cataloging |
| USMC | United States Marine Corps |
| USN | Update Sequence Number |
| USN | Unique Service Name |
| USOC | United States Olympic Committee |
| USPTO | United States Patents and Trademark Office |
| USRT | Universal Synchronous Receiver/ Transmitter |
| USSR | Union of Soviet Socialist Republics |
| UST | Underground Storage Tank |
| USTP | University Student Teacher Program |
| USTR | United States Trade Representative |
| USW | Update Status Word |
| UT | Union Territory |
| UT | User Type |
| UTF | Unwind Tape onto Floor |
| UTI | Unit Trust of India |
| UTI | Urinary Tract Infection |
| UTS | Ultimate Tensile Strength |
| UUID | Universally Unique Identifier |
| UUO | Unix-to- Unix Output flag |
| UVC | Usb Video Class |
| UVJ | Ureterovesical Junction |
| UVR | Ultra Violet Radiation |