| Acronym | Meaning |
 | TW | Twi Language (ISO 639-1 Code) |
| TWAIN | Technology Without An Interesting Name |
| TWAT | The War Against Terror |
| TWD | Taiwan Dollar (ISO 4217 Currency Code) |
| TWE | Trans World Entertainment |
| TWI | The Welding Institute |
| TWI | Twi Language (ISO 639-2 Code) |
| TWIP | Take What Insurance Pays - When A Surgeon Agrees To Accept A Lower Payment Than He Ordinarily Would For A Procedure And Not Charge The Patient The Difference |
| TWN | Republic Of China (Taiwan) (ISO 3166 Trigram) |
| TWP | Technical Working Paper |
| TWS | Thermal Weapon Sight - Track While Scan |
| TX | Texas (postal Symbol) - Transmit - Turkmenistan (FIPS 10-4 Country Code) |
| TY | Tahitian Language (ISO 639-1 Code) |
| TZ | Tanzania (ISO 3166 And FIPS 10-4 Country Code Digram) |
| TZA | Tanzania (ISO 3166 Trigram) |
| TZC | Tetrazolium Chloride |
| TZS | Tanzanian Shilling (ISO 4217 Currency Code) |
| U | Uranium |
| U?K | Initialism For Two Albanian Guerilla Movements |
| UA | Ukraine (ISO 3166 Digram)Unit Of Action |
| UAB | University Of Alabama At Birmingham |
| UAE | United Arab Emirates |
| UAH | Ukrainian Hryvnia (ISO 4217 Currency Code) |
| UAR | Uniformly At Random (probability) - United Arab Republic - Uni›n Argentina De Rugby (Spanish For Argentine Rugby Union) |
| UAV | Unmanned Aerial Vehicle - Unprotected Anal And Vaginal Sex |
| UBC | United Baptist Church - University Of British Columbia |
| UBIGEO | Ubicaci›n Geografica (Spanish For Geographical Location) |
| UBS | Unbundled Bitstream Services - United Bank Of Switzerland - United Banque Suisse |
| UCAV | Unmanned Combat Air Vehicle |
| UCBSA | United Cricket Board Of South Africa |
| UCF | University Of Central Florida |
| UCI | Union Cycliste Internationale (French |
| UCLA | University Of California |
| UCLES | University Of Cambridge Local Examinations Syndicate |
| UCR | University Of Costa Rica |
| UCS | Union Of Concerned Scientists |
| UDAS | Uppsala-DLR Asteroid Survey |
| UDDI | Universal Description |
| UDP | User Datagram Protocol |
| UDT | Underwater Demolition Team |
| UDTS | Uppsala-DLR Trojan Survey |
| UE | Unit Of Employment |
| UEFA | Union Of European Football Associations |
| UESAC | Uppsala-ESO Survey Of Asteroids And Comets |
| UFC | Ultimate Fighting Championship |
| UFO | Unidentified Flying Object - United Farmers Of Ontario |
| UG | Uganda (ISO 3166 And FIPS 10-4 Country Code Digram) |
| UG | Uyghur Language (ISO 639-1 Code) |
| UGA | Uganda (ISO 3166 Trigram) |
| UGV | Unmanned Ground Vehicle |
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