| Abbreviation | Definition |
|---|---|
| TSCC | Ticketing System Control Center |
| TSSA | Technical Support Services Agreement |
| TTBA | Texas Ticket Brokers Association |
| TTBA | Tri-Town Business Association |
| TTGP | Tactical Training Group Pacific |
| TTITOA | Trinidad and Tobago Incoming Tour Operators Association |
| TTMAC | Terrazzo, Tile, and Marble Association of Canada |
| TTN | Transnational Taxation Network |
| TTOF | Twin Towers Orphan Fund |
| TTSC | The Trademark Search Company |
| TTYC | Trabajos Topográficos Y Cartográficos |
| TUPAC | Tobacco Use Prevention and Control |
| TVB | Thames Valley Branch of the Association for Project Management |
| TWA | The Wireless Association |
| TWAS | Third World Academy of Sciences |
| TWAT | The Word Association Thread |
| TWAT | Topic The Word Association Thread |
| TWGM | Technical Working Group Meeting |
| TWTTP | The Way To Teach People |
| TWUA | Transport Workers Union of America |