| Abbreviation | Definition |
|---|---|
| CMCSS | Clarksville-Montgomery County School System |
| CMDA | Calcutta Metropolitan Development Authority |
| CMDS | Christ Methodist Day School |
| CMES | Carroll Manor Elementary School |
| CMES | Cumberland Mills Elementary School |
| CMHS | Cabell Midland High School |
| CMHS | Caddo Magnet High School |
| CMHS | Canon McMillan High School |
| CMHS | Cardinal McCarrick High School |
| CMHS | Central Mountain High School |
| CMHS | Cheyenne Mountain High School |
| CMHS | Cimarron Memorial High School |
| CMHS | Civic Memorial High School |
| CMHS | Costa Mesa High School |
| CMHS | Crete Monee High School |
| CMNS | Central Methodist Nursery School |
| CMS | Califf Middle School |
| CMS | Central Magnet School |
| CMS | Charlotte Mecklenburg Schools |
| CMSC | Chittagong Model School and College |