| Abbreviation | Definition |
|---|---|
| MSA | Maine Snowmobile Association |
| MSA | Mecklenburg Swim Association |
| MSA | Michigan Snowmobile Association |
| MSA | Middle States Association |
| MSA | Modernist Studies Association |
| MSA | Museum Store Association |
| MSAA | Maharashtra State Angling Association |
| MSAA | Midwest Ski Areas Association |
| MSAA | Minnesota State Archery Association |
| MSAA | Minnesota State Auctioneers Association |
| MSAD | Massachusetts State Association of the Deaf |
| MSAM | Marine Science Association Myanmar |
| MSAU | Muslim Students Association of Uganda |
| MSAZ | Muslim Students Association Zurich |
| MSBA | Manitoba School Boards Association |
| MSBA | Minnesota School Boards Association |
| MSBA | Minnesota School Boards Association's |
| MSBA | Minnesota State Bar Association's |
| MSBA | Mississippi School Boards Association |
| MSBA | Missouri School Board Association |