| Abbreviation | Definition |
|---|---|
| TTUL | Term Time Uniforms Ltd |
| TTV | Trunc Table Value |
| TTV | Tupaj-Technik Vertrieb |
| TTW | Transition Town Worthing |
| TTWC | Taiwan Tobacco and Wine Corporation |
| TTX | Teletrax |
| TTX | Therma- Tron- X, Inc. |
| TTX | Tony's Train Xchange |
| TTZ | Twin Turbo Zs of Dallas |
| TUA | Travel Ukraine Agency |
| TUAG | Triebwerk Unterhalt AG |
| TUD | Tactful, Unique Dynamic |
| TUD | Tactful, Unique & Dynamic |
| TUEC | TN Utility Education Corporation |
| TUG | The Ultimate Group |
| TUG | The Upstream Group |
| TUI | Technology Unlimited, Inc. |
| TUK | Telephone United Kingdom |
| TUP | Theosophical University Press |
| TUS | Tisfoon Ulterior Systems |