| Abbreviation | Definition |
|---|---|
| CMSCA | Central Missouri School Counselor Association |
| CMSCA | Chiang Mai Schools Cricket Alliance |
| CMSD | Canon McMillan School District |
| CMSD | Cheyenne Mountain School District |
| CMSD | Clarksdale Municipal School District |
| CMSD | Cleveland Metropolitan School District |
| CMSE | Chaska Middle School East |
| CMSE | Coppell Middle School East |
| CMSM | Central Maryland School of Massage |
| CMSN | Cabot Middle School North |
| CMSN | Coppell Middle School North |
| CMSS | Cabot Middle School South |
| CMW | C. Milton Wright |
| CNCS | Cardinal Newman Catholic School |
| CNCS | Central Navigation and Control School |
| CNCS | Chicago North Chinese School |
| CNH | Chuyên Nguy?n Hu? |
| CNH | Chuyên NguyÅn HuÇ |
| CNHS | Cardinal Newman High School |
| CNHS | Cavite National High School |