| Abbreviation | Definition |
|---|---|
| THUG | Tony Hawk's Underground |
| THV | T'rah Holliday Veal |
| THW | Texas Home Warranty |
| THW | Todd, Holloway, & Ward, P.C. |
| THX | Thompson Holminson Xperimental |
| THY | Turk Hava Yollari (Cyprus Turkish Airlines) |
| TI | Tankers International |
| TI | Texas Instruments |
| TI | Touring International |
| TI | Tourismo Internazionale |
| TI | Tube Investments |
| TIA | Thai Invention Association |
| TIA | Toys In the Attic |
| TIA | Trans International Airlines |
| TIAA | Teachers Insurance and Annuity Association |
| TIAA | Texas Independent Automotive Association |
| TIAC | The Internet Access Company |
| TIAC | The Internet Access Connection |
| TIAC | The Internet Access Corporation |
| TIAC | Title Industry Assurance Company |