| Abbreviation | Definition |
|---|---|
| TUAG | Telecommunication Users Advisory Group |
| TUANZ | Telecommunications Users Association of New Zealand |
| TUGI | Telecom Users Group of India |
| TUMS | Telephone and Utilities Maintenance System |
| TUP | Telephone User Part |
| TUP | Telephony User Part |
| TUR | Trunk Utilization Report |
| TUSO | Telecommunications Universal Service Obligation |
| TV | Television |
| TVL | Telecom Vanuatu Limited |
| TVL | Telecoms Virtual Library |
| TVM | T1 Voice Module |
| TVR | Telephone Voice Response |
| TW | TWinbrook (telephone exchange) |
| TWA | The Wireless Association |
| TWA | The Wireless Association (former Cellular Telecommunciations and Internet Association) |
| TWIE | Total Wireless In Ear |
| TWISP | The Welsh Internet Service Provider |
| TWL | Leased TeletypeWriter service |
| TWSS | Telecom Web Services Server |