| TAI | International Atomic Time | - | Atmospheric Research Center |
| TAL | Transatlantic Abort Landing | - | Atmospheric Research Center |
| TAU | Thousand Astronomical Unit | - | Atmospheric Research Center |
| TCM | Trajectory Control Maneuver | - | Atmospheric Research Center |
| TCS | Thermal Control System | - | Atmospheric Research Center |
| TDRS | Tracking And Data Relay Satellite | - | Atmospheric Research Center |
| TDRSS | Tracking And Data Relay Satellite System | - | Atmospheric Research Center |
| TDT | Terrestrial Dynamic Time | - | Atmospheric Research Center |
| TEA | Torque Equilibrium Attitude | - | Atmospheric Research Center |
| TES | Thermal Emission Spectrometer | - | Atmospheric Research Center |
| THIR | Temperature/Humidity Infrared Radiometer | - | Atmospheric Research Center |
| TIG | Time Of (until) Ignition | - | Atmospheric Research Center |
| TIROS | Television InfraRed Observation Satellite | - | Atmospheric Research Center |
| TKSC | Tsukuba Space Center | - | Atmospheric Research Center |
| TM | Thematic Mapper | - | Atmospheric Research Center |
| TOMS | Total Ozone Mapping Spectrometer | - | Atmospheric Research Center |
| TOPEX | Ocean Topography Experiment | - | Atmospheric Research Center |
| TOPS | Toward Other Planetary Systems | - | Atmospheric Research Center |
| TOS | Transfer Orbit Stage | - | Atmospheric Research Center |
| TPCE | Tank Pressure Control Experiment | - | Atmospheric Research Center |
| TPS | Thermal Protection System | - | Atmospheric Research Center |
| TRMM | Tropical Rainfall Measuring Mission | - | Atmospheric Research Center |
| TSM | Tail Service Mast | - | Atmospheric Research Center |
| TSPK | Tsentr Podgotovka Kosmonavti | - | Atmospheric Research Center |
| TSS | Targeted Search System / Tethered Satellite System | - | Atmospheric Research Center |
| TSTO | Two Stage To Orbit | - | Atmospheric Research Center |
| TSUP | Tsentr Upravileniya Polyoti | - | Atmospheric Research Center |
| TTC | Telemetry | - | Atmospheric Research Center |
| TWTA | Travelling Wave Tube Amplifier | - | Atmospheric Research Center |
