| Abbreviation | Definition |
|---|---|
| TIPS | Telephone Interpreting Service |
| TIPSS | Tal Information Processing Support Services |
| TIR | The Internet Ramp |
| TIRC | Taiwan Intelligent Robotics Company |
| TIS | Technical Information Service |
| TIS | The Interview Specialist |
| TIS | Tichenors Institutional Service |
| TIS | Titan International Shipping |
| TIS | Trusted Information Systems |
| TISCO | Tata Iron and Steel Company Limited |
| TISCO | TataCountry Iron and Steel Company |
| Tisco | Technology Innovation Service Company (New Zealand) |
| TISI | Team Industrial Services, Incorporated |
| TISI | Tenet Information Services, Incorporated |
| TIT | Tenchi In Tokyo |
| TIT | Trotter's Independent Trading |
| TITC | The International TEFL Corporation |
| TITL | Title Insurance Through Lawyers |
| TITS | Texas International Truck Stop |
| TITS | Tittle IT Solutions |