| Acronym | Meaning |
 | TRMM | Tropical Rainfall Measuring Mission |
| TROMEX | Tropical Meteorology Experiment |
| TROPAL | Tropical Alert Group |
| TROPEX | Tropical Experiment |
| TROPOZ | Tropospheric Ozone Experiment |
| TRW | Thundershowers |
| TRW SYSTEMS | Inc. |
| TSAO | Tropical Semiannual Oscillation |
| TSC | Technical Steering Committee |
| TSM | Theoretical Studies And Modeling |
| TTO | Transient Tracers In The Ocean |
| TTO/NAS | Transient Tracers In The Ocean (TTO)/North Atlantic Study |
| TUC | Traingle Universities Consortium |
| TUTT | Tropical Upper-tropospheric Trough |
| TUV | Tropospheric Ultraviolet And Visible Radiation Model |
| TVU | Television Unit |
| TWC | The Weather Channel |
| TWERLE | Tropical Wind |
| U MASS | University Of Massachusetts |
| U.S./JC | United States/Japan Cooperation |
| U.S./JC | United States/Japan Cooperation |
| UAC | United Aircraft Corporation |
| UAO | Upper Atmosphere Observatory |
| UARC | Upper Atmosphere Research Corporation |
| UARS | Upper Atmosphere Research Satellite |
| UAV | Unmanned Aerial Vehicles |
| UCAID | University Corporation For Advanced Internet Development |
| UCAR | University Corporation For Atmospheric Research |
| UCAR | Unmanned Combat Armed Rotorcraft |
| UCARF | UCAR Foundation |
| UCARIP | UCAR Intellectual Property |
| UCARIPO | UCAR Intellectual Property Officer |
| UCARNET | University Cooperation For Atmospheric Research Network |
| UCARSOFT | UCAR Software |
| UCARTS | UCAR Trade Secrets |
| UCLA | University Of California At Los Angeles |
| UCSB | University Of California At Santa Barbara |
| UCSD | University Of California At San Diego |
| UEDS | Unidata Experimental Data Service |
| UF | Universal Format |
| UGGI | See IUGG |
| UGV | Unmanned Ground Vehicles |
| UH | University Of Hawaii |
| UHF | Ultra-high Frequency |
| UHF | Ultra-high Frequency |
| UHURU | N/A |
| UHV | Use An Ultrahigh Vacuum |
| UI | Unit Of Issue |
| UI/UM PRICE | Unit Of Issue/Unit Of Measure Price |
| UIC | Unit Identification Code |
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