| Abbreviation | Definition |
|---|---|
| MBS6/11 | Marine Bombing Squadron Six-Eleven Foundation |
| MC | Malaria Consortium |
| MCA | ilitary Cadet of America |
| MCA | ilitary Cadets of America |
| MCA | Massachusetts Chess Association |
| MCA | Military Cadet of America? |
| MCA | Military Cadet of America℠ |
| MCA | Military Cadets of America? |
| MCA | Military Cadets of America℠ |
| MCA | Military Chaplains' Association of the United States of America |
| MCAS | Michigan Children's Aid Society |
| MCAS | Mound City Archaeological Society |
| MCAUSA | Military Chaplains' Association of the United States of America |
| MCA-USA | Military Chaplains' Association of the United States of America |
| MCCA | Monroe County Commission on Aging |
| MCCD | Michigan Council on Crime and Delinquency |
| MCCL | Minnesota Citizens Concerned for Life |
| MCCSCF | Marine Corps Command and Staff College Foundation |
| MCCT | Mother & Child Cash Transfer |
| MCCT | Mother & Child Cash Transfer Plus |