| MHSA | Montana High School Association | 蒙大拿州高中协会 |
| MHSA | Michigan Head Start Association | 密歇根州创业协会 |
| MHSA | Missouri Horse Shows Association | 密苏里马展协会 |
| MHSA | Manufacturers' Health & Safety Association | 健康与安全协会的制造商 |
| MHSA | Mars Horizon Sensor Assembly | 火星地平线传感器组件 |
| MHSA | Maryland Horse Shows Association | 马里兰州赛马会 |
| MHSA | Mental Health and Substance Abuse | 精神健康与药物滥用 |
| MHSA | Maryland High School Assessment | 马里兰高中评估 |
| MHSA | Mennonite Historical Society of Alberta (Canada) | 阿尔伯塔省门诺派历史学会（加拿大） |
| MHSA | Master of Health Services Administration (graduate degree) | 卫生服务管理硕士（研究生学位） |
| MHSA | microaggregated human serum albumin | 微量聚集人血清白蛋白 |
| MHSA | master of health service administration | 卫生服务管理硕士 |
| MHSA | Mine Health and Safety Act (South Africa) | 《矿山健康与安全法》（南非） |
| MHSA | Methylated Human Serum Albumin | 甲基化人血清白蛋白 |
| MHSA | Mental Health Services Act | 《精神卫生服务法》 |
| MHSA | Master of Health Services Administration | 卫生服务管理硕士 |