| Abbreviation | Definition |
|---|---|
| MBLA | Moroccan Biodiversity and Livelihoods Association |
| MBMA | Metal Buildings Manufacturers Association |
| MBNA | Monument Builders National Association |
| MBOA | Manitoba Building Officials Association |
| MBOA | Maryland Building Officials Association |
| MBOA | Metropolitan Basketball Officials Association |
| MBOT | Malaysia Board of Technologists |
| MBPA | Malta Business Professional Association |
| MBRA | Midwest Bull Riders Association |
| MBRA | Mission Bay Rowing Association |
| MBSA | Manalapan Baseball and Softball Association |
| MBSA | Midwest Building Suppliers Association |
| MBSA | Multicultural Business Student Association |
| MBSA | Mundelein Baseball and Softball Association |
| MBUTA | Manhattan Beach Unified Teachers Association |
| MBWA | Met Basketball Writers Association |
| MCA | Management Consulting Association |
| MCA | Marine Corps Association |
| MCA | Michigan Concrete Association |
| MCA | Minnesota Chiropractic Association |