| Abbreviation | Definition |
|---|---|
| TRE | Thugs, Revolutionists, And Entrepreneurs |
| TREVI | Terrorism Radicalism Extremism Violence International |
| TRI | The Reconstruction Initiative |
| TRIC | The Revolution Is Coming |
| TRIO | The Rebellion Is On |
| TSU | Transitional/ Temporary Shelter Units |
| TTI | Travel Technology Initiative |
| TTO | Transfer To Oas |
| TTP | Threat To Peace |
| TUAC | Train Up A Child |
| TUC | Trade Union Congress |
| TUR | Terrorist Underground Rebellion |
| TVA | The Veiled Alliance |
| TVRQ | Travel Request |
| TWM | Third World Majority |
| TYA | THIMUN Youth Assembly |
| TYN | ThimunYouth.Net |
| U5MR | Under 5 Mortality Rate |
| UCB | Union Chimique Belge |
| UCCC | UNESCO Chair on Cyberspace & Culture |