| Acronym | Meaning |
| TIFF | Tag Image File Format |
| TIGCM | Thermosphere-ionosphere General Circulation Model |
| TIME | Thermosphere-ionosphere-mesosphere-electrodynamics |
| TIME-GCM | Thermosphere-ionosphere-mesosphere-electrodynamic General Circulation Model |
| TIME-GCM | Thermosphere-Ionosphere-Mesosphere-Electrodynamic General Circulation Model |
| TIMED | Thermosphere-Ionosphere-Mesosphere Energetics & Dynamics |
| TIMS | Thermal Infrared Multispectral Scanner |
| TING | Thermosphere-Ionosphere Nested Grid Model |
| TIP | Terminal Interface Processor |
| TIP | TIROS Information Processor |
| TIPIC | Transformation D'Idees En Produits Industrialisables Et Commercialisables |
| TIPMEX | Tibetan Plateau Meteorological Experiment |
| TIPMEX | Tibetan Plateau Meteorological Experiment |
| TIROS | Television And Infrared Operational Satellite |
| TIROS | Thermal Infrared Observational Satellite |
| TIROS I | Television Infrared Observation Satellite |
| TIWEX | Tropical Institute (or Instability) Wave Experiment |
| TKE | Turbulent Kinetic Energy |
| TKW | Turbulence Kinematic Energy |
| TLLMES | The Institute For Integrative And Multidisciplinary Earth Studies |
| TLS | Tunable Laser Spectroscopy |
| TM | Thermatic Mapper |
| TM | Team Member |
| TMD | Thailand Meteorological Department |
| TMS | Thermatic Mapper Simulator |
| TOA | Top Of The Atmosphere |
| TOGA | Tropical Ocean And Global Atmosphere Program(me) |
| TOGA COARE | The Tropical Ocean And Global Atmosphere Program's Coupled Ocean-Atmosphere Response Experiment |
| TOM | Trunk Operations Monitor |
| TOMS | Total Ozone Mapping Spectrometer |
| TOPCAT | A Clear Air Turbulence Measurement Program |
| TOPEX | Topographic Ocean Experiment |
| TOPEX/POSEIDON | Ocean Topography Experiment |
| TOPS | Transcendental Operating System |
| TOPSE | Tropospheric Ozone Production About The Spring Equinox |
| TOS | Tiros Operational Satellite |
| TOSS | Tiros Operational Satellite System |
| TOTO | Totable Tornado Observatory |
| TOVS | TIROS Operational Vertical Sounder |
| TPF&C | Towers |
| TRACE | Transport And Atmospheric Chemistry Near The Equator |
| TRACE | Trace Remote Atmospheric Chemical Evaluation |
| TRACE | Transition Region And Coronal Explorer |
| TRACE-P | Transport And Atmospheric Chemistry Near The Equator |
| TRACON | Terminal Radar Control |
| TRACS | Trends In Atmospheric Constituents Study |
| TRANET | Tracking Network |
| TREC | Tracking Radar Echoes By Correlation |
| TREM | Tropical Rainfall Explorer Mission |
| TRIP | Thunderstorm Research International Program |