| MASM | Macro Assembler 
| Others |
| MASM | Marine Aquarium Society of Michigan
| Others |
| MASM | Marinelife Aquarium Society of Michigan
| Others |
| MASM | Master of Aging Services Management
| Others |
| MASM | Master of Arts in Sport Management
| Others |
| MASM | Medical Aid Society of Malawi
| Others |
| MASM | Michigan Academy Sleep Medicine
| Others |
| MASM | Microsoft Macro Assembler
| Others |
| MASM | Mid America Science Museum
| Others |
| MASM | Mid Atlantic Soft Matter
| Others |
| MASM | Mike Aaron Signature Model
| Others |
| MASM | Military Assistance Sales Manual
| Others |
| MASM | Modeling and Analysis of Semiconductor Manufacturing
| Others |
| MASM | Mongolian Agency for Standardization and
| Others |
| MASM | Mongolian Agency for Standardization and Metrology
| Others |
| MASM | Mongolian Association of Surveying and Mapping
| Others |
| MASM | Muslim American Society of Minnesota
| Others |