| Acronym | Definition |
|---|
| MSSA➣Mind Sports South Africa |
| MSSA➣Microsoft Software & Systems Academy |
| MSSA➣Methicillin-Sensitive Staphylococcus Aureus |
| MSSA➣Medical Service Study Area (California) |
| MSSA➣Military Selective Service Act |
| MSSA➣Military Style Semi-Automatic Firearm (classification, New Zealand) |
| MSSA➣Musis Sacrum Schouwburg Arnhem (Dutch theater) |
| MSSA➣Microscopy Society of Southern Africa |
| MSSA➣Maryland Saltwater Sportfishermen's Association |
| MSSA➣Mid-South Sociological Association |
| MSSA➣Microscopy Society of America |
| MSSA➣Mississauga Synchronized Swimming Association (Canada) |
| MSSA➣Minnesota Social Service Association |
| MSSA➣Multi-Channel Singular Spectral Analysis |
| MSSA➣Missouri Sport Shooting Association (Columbia, MO) |
| MSSA➣Mid South Sign Association |
| MSSA➣Master of Science in Social Administration (Case Western Reserve University, Cleveland, Ohio) |
| MSSA➣Memphis Sport Shooting Association |
| MSSA➣Master Service and Supply Agreement (contracts) |
| MSSA➣Modified Selective Severity Assessment (substance abuse) |
| MSSA➣Master Safeguards and Security Agreement |
| MSSA➣Monteagle Sunday School Assembly (Monteagle, TN) |
| MSSA➣Multi Sensor Surveillance Aircraft (Westinghouse, Baltimore) |
| MSSA➣Mansoura Students' Scientific Association (Mansoura, Egypt) |
| MSSA➣Mobile Self-Storage Association |
| MSSA➣Middle School Soccer Association |
| MSSA➣Microsoft Security Support Alliance |
| MSSA➣Mission Supply Support Activity |
| MSSA➣Malaysian Steel Structure Association |
| MSSA➣Middlesex School of Summer Arts (Concord, MA) |
| MSSA➣Mission Supply Support Account (US Army) |
| MSSA➣Montessori School of San Antonio (Texas) |
| MSSA➣Multiscale Statistical Signal Analysis |
| MSSA➣Microsoft South Africa |
| MSSA➣Managed Services Service Assurance |
| MSSA➣Manchester Student Society of Architects (UK) |