| MSA(S) | Metropolitan Statistical Area(S) 
| Others |
| MSA(S) | Microtubule-Stabilizing Agent(S)
| Others |
| MSAS | Mambo Stand Alone Server
| Others |
| MSAS | Mansfield and Sutton Astronomical Society
| Others |
| MSAS | Master of Science in Administrative Studies
| Others |
| MSAS | Master of Science in Applied Statistics
| Others |
| MSAS | Mcafee Security Alerting Service
| Others |
| MSAS | Mexborough and Swinton Astronomical Society
| Others |
| MSAS | Mexborough Swinton Astronomical Society
| Others |
| MSAS | Microsoft Analysis Services
| Others |
| MSAS | Microsoft Server Active Sync
| Others |
| MSAS | Mountain Skies Astronomical Society
| Others |
| MSAS | MTSAT Satellite Augmentation System
| Others |
| MSAS | Multi-functional Satellite Augmentation System
| Others |
| MSAS | Multiple Shadow Address Space
| Others |
| MSAS | Multiple-Shadow Address Space
| Others |
| MSAS | Municipal State Aid Street
| Others |