| MSSO | Maintenance and Support Services Organization | 维护和支持服务组织 |
| MSSO | Medical Students And Sites Officer | 医学生和现场官员 |
| MSSO | Museum Studies Student Organization | 博物馆研究学生组织 |
| MSSO | Medical Scientist Student Organization | 医学科学家学生组织 |
| MSSO | Multi-Stage Self-Organizing | 多阶段自组织 |
| MSSO | Munich Symphonic Sound Orchestra | 慕尼黑交响乐团 |
| MSSO | MILSATCOM Systems Sustainment Office | 军事卫星通信系统维持办公室 |
| MSSO | Mission Services and Support Office | 特派团服务和支助办公室 |
| MSSO | Multiple Source Simple Output | 多源简单输出 |