| Abbreviation | Definition |
|---|---|
| MSBA | Missouri School Boards Association |
| MSBA | Money Services Business Association |
| MSBOA | Minnesota School Bus Operators Association |
| MSCA | Maryland School Counselor Association |
| MSCA | Michigan School Counselor Association |
| MSCA | Mid South Cartoonists Association |
| MSCA | Mid South Compensation Association |
| MSCA | Minnesota School Counselors Association |
| MSCA | Minnesota Shopping Center Association |
| MSCA | Missouri School Counselor Association |
| MSCA | Missouri State Chiropractors Association |
| MSDA | Michigan Soft Drink Association |
| MSDA | Michigan Sporting Dog Association |
| MSDA | Michigan Swing Dance Association |
| MSDBA | Metro and Southern Districts Basketball Association |
| MSDBA | Metro Southern Districts Basketball Association |
| MSDBA | Mumbai Suburban District Badminton Association |
| MSEA | Magadh Stock Exchange Association |
| MSEA | Maine State Employees Association |
| MSEA | Mississippi State Equine Association |