| Acronym | Meaning |
 | TRD | Towed Radar Decoy |
| TRIGAT | Third Generation Antitank (missile) |
| TRL | Technology Readiness Level |
| TRP | Target Reference Point -Time Of Reporting |
| TRP | Troop |
| TRU | Transuranic |
| TRUEX | Training In Urban Environment Exercise |
| TRW | Thompson Ramo Wooldridge Inc. |
| TRY | Turkish Lira (ISO 4217 Currency Code) |
| TS | Terasecond |
| TS | Terasiemens - Thunderstorm (METAR Code) - Tunisia (FIPS 10-4 Country Code) -TinySex - Transsexual |
| TS | Tsonga Language (ISO 639-1 Code) |
| TSA | Theatre Storage Area - Time Slot Allocation - Transportation Security Administration |
| TSCA | Toxic Substances Control Act (tosca) |
| TSEC | Transmission Security Encryption Code |
| TSL | Transportation Security Laboratory |
| TSN | The Sporting News - The Sports Network |
| TSN | Tswana Language (ISO 639-2 Code) |
| TSO | The Stationery Office (was HMSO Until 1996) - (U.S.) TRICARE Support Office |
| TSO | Tsonga Language (ISO 639-2 Code) |
| TSOP | Tactical Standing Operation Procedure |
| TSR | Many |
| TSSIA | The Subject Says It All |
| TT | Tatar Language (ISO 639-1 Code) |
| TT | Teratesla -Terrestrial Time - Tourist Trophy (Motorcycle Sport) -Trinidad And Tobago (ISO 3166 Digram) |
| TTD | Trinidad And Tobago Dollar (ISO 4217 Currency Code) |
| TTFN | Ta Ta For Now |
| TTL | Time 'till Live - Time To Live - Transistor-transistor Logic |
| TTO | Trinidad And Tobago (ISO 3166 Trigram) |
| TTP | Tactics |
| TTTEAF | Thomas The Tank Engine And Friends |
| TTY | TeleTYpewriter (Printer) |
| TTYL | Talk To You Later (Internet Slang) |
| TTZ | Tetrazolium |
| TU | Technische Universit?t (German For Technical University) - Thammasat University (Thailand) -Turkey (FIPS 10-4 Country Code) |
| TUC | Trades Union Congress |
| TUG | TeX Users Group |
| TUI | Text User Interface (cf. CLI) |
| TUK | Turkmen Language (ISO 639-2 Code) |
| TUN | Tunisia (ISO 3166 Trigram) |
| TUNS | Technical University Of Nova Scotia |
| TUR | Turkey (ISO 3166 Trigram) |
| TUR | Turkish Language (ISO 639-2 Code) |
| TUSK | Tank Urban Survival Kit |
| TUV | Tuvalu (ISO 3166 Trigram) |
| TV | Television -Teravolt -Transvestite -Tuvalu (ISO 3166 And FIPS 10-4 Country Code Digram) |
| TVA | Tennessee Valley Authority |
| TVG | Tick |
| TVR | TreVor (Wilkinson) Racing |
| TW | Republic Of China (Taiwan) (ISO 3166 And FIPS 10-4 Country Code Digram) - Terawatt |
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