| TCIS | Taaleem College of International Studies 
| Others |
| TCIS | Tactical Communications Interface Software
| Others |
| TCIS | Taejon Christian International School
| Others |
| TCIS | Taylor County Intermediate School
| Others |
| TCIS | Teacher Certification Information System
| Others |
| TCIS | Technical Controls and Inspection Services
| Others |
| TCIS | Technology Consulting and Integration Solutions
| Others |
| TCIS | Terwilliger Center for Innovation in Shelter
| Others |
| TCIS | Thai Chinese International School
| Others |
| TCIS | Thai-Chinese International School
| Others |
| TCIS | The Complete Insurance Source
| Others |
| TCIS | Therapeutic Crisis Intervention for Schools
| Others |
| TCIS | Tidewater Conference of Independent Schools
| Others |
| TCIS | TIFR Centre for Interdisciplinary Sciences
| Others |
| TCIS | Time Critical Information Services
| Others |
| TCIS | Traffic Collision Investigation Squad
| Others |
| TCIS | Transitional Carcinoma In Situ
| Others |
| TCIS | Treasury Check Information System
| Others |
| TCIS | Tropical Cyclone Information System
| Others |
| TCIS | Truck Crash Injury Study
| Others |