| MSSM | Maine School of Science and Mathematics 
| Others |
| MSSM | Master of Science in Software Management
| Others |
| MSSM | Master of Science in Sport Management
| Others |
| MSSM | Master of Science in Sports Management
| Others |
| MSSM | Master of Science in Strategic Management
| Others |
| MSSM | Master of Science in Sustainability Management
| Others |
| MSSM | Medical Staff Services Management
| Others |
| MSSM | Minimal Supersymmetric Standard Model
| Others |
| MSSM | Minimal Sypersymmetric Standard Model
| Others |
| MSSM | Mount Sinai School of Medicine
| Others |
| MSSM | Mud Slinging Social Misfits
| Others |
| MSSM | Mutually supportive systems model
| Others |