| Abbreviation | Definition |
|---|---|
| TTR | The Training Registry |
| TTR | To The Rescue Web Design |
| TTR | Transport Travel Research, Ltd. |
| TTS | The Turbo Shop |
| TTSI | Tatitlek Training Services Inc |
| TTSI | Total Transcription Solutions Inc |
| TTSI | Total Transportation Services Inc |
| TTSL | Tata Tele Services Ltd |
| TTSL | Thiagarajar Telekom Solutions Ltd |
| TTSL | Tora Trading Services LLC |
| TTT | Thai Tiki Towers |
| TTT | Thomas Truck Training |
| TTT | Thompson Talk Translation |
| TTT | Totara's Thinking Thursdays |
| TTT | Translation Research Group |
| TTTL | Toyota Trinidad and Tobago Ltd |
| TTTL | Toyota Trinidad Tobago Ltd |
| TTTT | Tyes Top Tour and Travel |
| TTU | Toyo Tanso USA, Inc. |
| TTU | Toyo Tanso USA, Incorporated |