| Abbreviation | Definition |
|---|---|
| CLMS | Corner Lake Middle School |
| CLMS | Corriher Lipe Middle School |
| CLMS | Crews Lake Middle School |
| CLMS | Crystal Lake Montessori School |
| CLMS | Cypress Lake Middle School |
| CLPS | Center Line Public Schools |
| CLPS | Central Lake Public Schools |
| CLPS | Crumpsall Lane Primary School |
| CLSA | Classical Latin School Association |
| CLSB | City of London School for Boys |
| CLSC | Chinese Language School of Columbia |
| CLSD | Cornwall Lebanon School District |
| CLSG | City of London School for Girls |
| CLST | Christian Life School of Theology |
| CLWS | City of Lakes Waldorf School |
| CMA | Chicago Military Academy |
| CMC | Content Mastery Center |
| CMCS | Calvary Murrieta Christian Schools |
| CMCS | Coastal Montessori Charter School |
| CMCS | Countryside Montessori Charter School |