| TA | Type Approval |
| TA-Code | Traffic Announcement Code |
| TAS | Temperaturabhängiger Startmengen- |
| TBI | Throttle-Body Injection |
| TBO | Time Between Overhaul |
| TCA | Thermographic Combustion Analysis |
| TCI | TurboCharged Intercooled |
| TCP | Transmission Control Protocol |
| TCS | Traction controll system |
| TDC | Top Dead Center |
| TDMA | Time Division Multiplex Access |
| TEM | Transversales elektromagnetisches Feld |
| TETRA | Trans European Trunked Radio |
| TFM | Transversalflussmaschine |
| TFT | thin-film transistor, |
| TFT-LCD | Thin-Film Transistor Liquid-Crystal Display |
| TIF | Tagged Image Formate |
| TIMS | Tire Inflation Monitoring System |
| TLEV | Transient Low Emission Vehicle |
| TLS | Transport Layer Security |
| TMC-Code | Traffic Message Channel Code |
| TME | Tallow Methyl Ester |
| TN-LCD | Twisted Nematic-Liquid Crystal Display |
| TNB | Total Base Number |
| TOF | Time of Flight |
| TP-Code | Traffic Programm Code |
| TPM | Total Productive Maintenance |
| TPMS | Tire Pressure Monitoring System |
| TPS | Throttle Position Sensor |
| Triac | Triode Alternating Current Switch |
| Trip | Transition induced plasticity |
| TSD | Torsionsschwingweg |
| TSZ-K | Kontaktgesteuerte Transistor-Spulen- |
| TTCAN | Time Triggered CAN |
| TTL | Transistor Transistor Logic |
| TTP | Time Triggered Protocol |
| TÜA | Technische Überwachungs-Anstalt |
| TÜV | Technischer Überwachungs Verein |
| TVI | Trans Valve Injektion |
| twi | Tire wear indicator |
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