| Abbreviation | Definition |
|---|---|
| CTS | Connecting the Schools |
| CTSA | Claire Trevor School of the Arts |
| CTSBS | Certified Texas School Business Specialist |
| CTSP | Cape Town School Of Photography |
| CTSP | Chinese Taipei School Penang |
| CUMP | Crestview United Methodist Preschool |
| CUS | C U S Catholic University School |
| CUS | Catholic University School |
| CUSD | Capistrano Unified School District |
| CUSD | Carlsbad Unified School District |
| CUSD | Central Unified School District |
| CUSD | Chandler Unified School District |
| CUSD | Chester Upland School District |
| CUSD | Chinle Unified School District |
| CUSD | Claremont Unified School District |
| CUSD | Cloverdale Unified School District |
| CUSD | Clovis Unified School District |
| CUSD | Coronado Unified School District |
| CUSD | Cupertino Union School District |
| CUSF | Champaign Urbana Schools Foundation |