| Abbreviation | Definition |
|---|---|
| CSSI | Caribbean Safe Schools Initiative |
| CSSI | Charter School Support Initiative |
| CSSI | Colorado School Support Initiative |
| CSSI | Comprehensive School Safety Initiative |
| CSSM | Columbus School of Supernatural Ministry |
| CSSM | Convergence School of Supernatural Ministry |
| CSSR | Center for Secondary School Redesign |
| CSSR | Comprehensive Services and School Readiness |
| CSSS | California School Staff Survey |
| CSSS | Center for Safe and Secure Schools |
| CSSS | Complex Systems Summer School |
| CSSW | Chinese School of Southern Westchester |
| CSSW | Columbia School of Social Work |
| CST | Car System Training |
| CST | Claremont School of Theology |
| CSTM | Common School Trustee Minutes |
| CSTSC | Combat System Technical Schools Command |
| CSUS | Crystal Springs Uplands School |
| CSVA | Canterbury School of Visual Arts |
| CSVP | Coordinated School Visit Program |