| Abbreviation | Definition |
|---|---|
| MCBA | Moody Centre Business Associations |
| MCCA | Michigan Catastrophic Claims Association |
| MCDA | Minnesota Career Development Association |
| MCFB | Multi Cultural Family Base |
| MCIP | Member of Canadian Institute of Planners |
| MCRA | Masters Cycle Racing Association |
| MCSA | Major County Sheriffs' Association |
| MCSA | Manitoba Country Songwriters Association |
| MCSA | Massachusetts Communications Supervisors Association |
| MCSA | Michigan Contract Security Association |
| MCTM | Maryland Council of Teachers of Mathematics |
| MCTM | Michigan Council of Teachers of Mathematics |
| MCTM | Minnesota Council of Teachers of Mathematics |
| MCTM | Missouri Council of Teachers of Mathematics |
| MCTM | Montana Council of Teachers of Mathematics |
| MDMA | Medical Device Manufacturers Association |
| MDMA | Multi Drug Manufacturing Association |
| MDNA | Machinery Dealers National Association |
| MEA | Mechanical Engineering Association |
| MEA | MidAtlantic Employers' Association's |