| Acronym | Definition |
|---|
| MHSA | Mental Health & Substance Abuse (various locations) |
| MHSA | Master of Health Services Administration (graduate degree) |
| MHSA | Montana High School Association |
| MHSA | Mine Health and Safety Act (South Africa) |
| MHSA | Mental Health Self Assessment (US DoD) |
| MHSA | Mennonite Historical Society of Alberta (Canada) |
| MHSA | Manufacturers' Health & Safety Association |
| MHSA | Missouri Horse Shows Association |
| MHSA | Maryland Horse Shows Association |
| MHSA | Maryland High School Assessment |
| MHSA | Mercure Hotel Sydney Airport (Australia) |