| Acronym | Definition |
|---|
| TCIS | Taejon Christian International School (Korea) |
| TCIS | Thai Chinese International School |
| TCIS | Teacher Certification Information System |
| TCIS | Tidewater Conference of Independent Schools |
| TCIS | Trial Court Information System |
| TCIS | Treasury Check Information System |
| TCIS | Tactical Communications Interface Software |
| TCIS | Taux de Chômage à Inflation Stationnaire (French: Non-Accelerating-Inflation Rate of Unemployment) |
| TCIS | TIE Control and Integration Subsystem |
| TCIS | Traitement Cooperatif et Integration des Systèmes |
| TCIS | Transport Canada Information Service |
| TCIS | Tactical Command Information System |
| TCIS | Targys Customer Inquiry System |