| Acronym | Definition |
|---|
| MASS | Massachusetts (old style) |
| MASS | IEEE International Conference on Mobile Ad Hoc and Sensor Systems |
| MASS | Massachusetts Association of School Superintendents |
| MASS | Marine Air Support Squadron |
| MASS | Magic Angle Sample Spinning |
| MASS | Mathematics Advanced Study Semesters |
| MASS | Mobile Adhoc and Sensor Systems (IEEE conference) |
| MASS | Mesoscale Atmospheric Simulation System |
| MASS | Michigan Agricultural Statistics Service |
| MASS | Mississippi Association of School Superintendents |
| MASS | Multi-Agent Security and Survivability (IEEE Symposium) |
| MASS | Michigan Aging Services System |
| MASS | Mass Area Superior Sampling Technology (NEC) |
| MASS | Mathématiques et Sciences Sociales (French: Mathematics and Social Sciences) |
| MASS | Modular Aerial Spray System |
| MASS | Medio Ambiente, Salud y Seguridad (Spanish: Environment, Health and Safety) |
| MASS | Mobility Analysis Support System |
| MASS | Military Airborne Surveillance System |
| MASS | Michigan Association of Staffing Services |
| MASS | Montana Association of School Superintendents (Helena, MT) |
| MASS | Maintenance Automation System Software (FAA) |
| MASS | MICAP Asset Sourcing System |
| MASS | Modular Aquatic Simulation System |
| MASS | Material Accountability and Safeguards System (Los Alamos) |
| MASS | Modern Army Supply System |
| MASS | Maritime Air Surface Surveillance |
| MASS | Maritime Air Sea Surveillance |
| MASS | Maritime Air Surveillance Support |
| MASS | Micro Actuators, Sensors & Systems (Group) |
| MASS | Military Airlift Survivability Study |
| MASS | MOBCON Automated Support System |
| MASS | Municipality of Anchorage Standard Specification |
| MASS | Modern, Artistic, Structural, Sustainable (construction) |
| MASS | Modular Adaptive Signal Sorter |
| MASS | Minimum Aircraft Systems Performance Specifications |
| MASS | Modular Acoustics Simulation System |
| MASS | Medium Acquisition Sun Sensor |
| MASS | MAGIC Automated Data Processing Support System |
| MASS | Multi-Array Simulator/Stimulator |
| MASS | Modular Aircraft Support System |
| MASS | Multiline Accuracy Support System (USPS) |
| MASS | Multi Ammunition Softkill System (naval self-defence system; Rheinmetall; Germany) |
| MASS | Massachusetts Anti-Slavery Society (est. 1835) |