| Abbreviation | Definition |
|---|---|
| MCLF | Marine Corps League Foundation |
| MCLF | Micaela Children's Liver Foundation |
| MCLH | Malawi Child Lung Health |
| MCLHP | Malawi Child Lung Health Program |
| MCMC | Maryland Center for Missing Children |
| MCO | Monocone Charity Organization |
| MCOP | Monroe County Opportunity Program |
| MCOPS | Motorcycle Community Organization for Peace and Security |
| MCPC | Macomb County Prevention Coalition |
| MCRC | Metropolitan Community Resource Center |
| MCRI | Midwest Coalition to Reduce Immigration |
| MCSA | Masonic Communities Services Association |
| MCSA | Masonic Communities & Services Association |
| MCSA | Muscatine Center for Social Action |
| MCSC | Missing Children Society of Canada |
| MCSF | Marine Corps Scholarship Foundation |
| MCSI | Missionary Care Services International |
| MCSL | Monroe County Senior Legal |
| MCSLS | Monroe County Senior Legal Services |
| MCT | Missoula Children's Theatre |