| Abbreviation | Definition |
|---|---|
| USS | United States Standard |
| USS | Utility Support Structure |
| UST | United States Testing Company |
| UST | Universal Servicing Tool |
| USTDC | University-affiliated Spaceport Technology Development Contract |
| USV | Upper Stage Vehicle |
| UT | Umbilical Tower |
| UT | Unit Tester |
| UT | Universal Time (replaced GMT in 1928) |
| UT&GS | Uplink Text and Graphics System |
| UTA | Umbilical Termination Assembly |
| UTC | Unit Test Case |
| UTC | United Technologies Corporation |
| UTC | United Technology Center |
| UTC | Universal Test Console |
| UTE | Universal Test Equipment |
| UTIL | UTILity |
| UTLM | Up TeLeMetry |
| UTRC | United Technology Research Center |
| UTS | Ultimate Tensile Strength |