| Acronym | Definition |
|---|
| MSA | Medical Savings Account (from IRS Form 5329) |
| MSA | Master of Science In Administration |
| MSA | Metropolitan Statistical Area |
| MSA | Measurement Systems Analysis |
| MSA | Muslim Students Association |
| MSA | Master Settlement Agreement (tobacco settlement) |
| MSA | Muslim Student Association |
| MSA | Maryland School Assessment |
| MSA | Management Science Associates, Inc (Pittsburgh, PA) |
| MSA | Multiple Sequence Alignment |
| MSA | Microscopy Society of America |
| MSA | Multiple System Atrophy (aka Shy-Drager Syndrome) |
| MSA | Modern Standard Arabic |
| MSA | Middle States Association |
| MSA | Museum Store Association |
| MSA | Mine Safety Appliances Company |
| MSA | Master of Science in Accounting (degree) |
| MSA | Master Services Agreement (consulting) |
| MSA | Mineralogical Society of America |
| MSA | Measurement System Analysis |
| MSA | Missouri Students Association |
| MSA | Motorway Service Area (UK) |
| MSA | Archer Medical Savings Account |
| MSA | Malta Standards Authority |
| MSA | Manchester School of Architecture |
| MSA | Methane Sulfonic Acid |
| MSA | Middle Stone Age |
| MSA | Multi-Service Access |
| MSA | Multisource Agreement |
| MSA | Marital Settlement Agreement |
| MSA | Minnesota Student Association (University of Minnesota) |
| MSA | Minimum Safe Altitude |
| MSA | Maryland State Assessment |
| MSA | Masonic Service Association |
| MSA | Medical Services of America (Lexington, SC) |
| MSA | Maryland Stadium Authority (Maryland) |
| MSA | Modular SAN Array (HP) |
| MSA | Microsoft Systems Architecture |
| MSA | Maritime Safety Agency (Japan) |
| MSA | Royal Automobile Club Motor Sports Association (was RACMSA) |
| MSA | Metropolitan Service Area |
| MSA | Maine Snowmobile Association |
| MSA | Major System(s) Acquisition |
| MSA | Multivariate Statistical Analysis |
| MSA | Musicological Society of Australia (est. 1963) |
| MSA | Most Severely Affected |
| MSA | Minimum Sector Altitude |
| MSA | Mouvement Souveraineté-Association (Organisation for Quebec Independence; Canada) |
| MSA | Marine Safety Agency |
| MSA | Metro Survey Area |
| MSA | Missouri Scholars Academy |
| MSA | Maritime Surveillance Aircraft |
| MSA | Method of Successive Averages |
| MSA | Most Seriously Affected |
| MSA | Master Senior Appraiser (certification) |
| MSA | Malaysian Scientific Association |
| MSA | Maintenance Service Agreement |
| MSA | Methanesulphonate |
| MSA | Maritime Situational Awareness (NATO) |
| MSA | Munitions Storage Area (US DoD) |
| MSA | Multilateral Steel Agreement |
| MSA | Muslim Scholars Association |
| MSA | Market Service Area |
| MSA | Merit Salary Adjustment |
| MSA | Microstrip Patch Antenna |
| MSA | Melissa Sue Anderson (actress) |
| MSA | Management System Audit |
| MSA | Method of Standard Addition |
| MSA | Modern Sciences and Arts University (Egypt) |
| MSA | Medical Services Account |
| MSA | Member Services Area |
| MSA | Mission Staff Assistant |
| MSA | Marin School of the Arts (Novato High School; Novato, CA) |
| MSA | Maritime Security Act of 1996 |
| MSA | Mastery of Scottish Arts (Bellevue, WA) |
| MSA | Managed Service Account (Microsoft) |
| MSA | Midwest Sunbathing Association (AANR region) |
| MSA | Mid-Stage Assessment (UK project management) |
| MSA | Microsoft Student Ambassador |
| MSA | Missouri Society of Anesthesiologists |
| MSA | Million Standard Axles (transportation engineering) |
| MSA | Minnesota Stroke Association |
| MSA | Management Science of America |
| MSA | Master Sales Agreement |
| MSA | Maximum Size Aggregate |
| MSA | Minnesota Software Association |
| MSA | Micro-Strip Antenna |
| MSA | Management Systems Architecture |
| MSA | Microgravity Science and Applications |
| MSA | Minnesota Society of Anesthesiologists |
| MSA | Missionaries of the Holy Apostles (religious order) |
| MSA | Monash Student Association (Clayton) Inc (Australia) |
| MSA | Meat Sheep Alliance of Florida (Lake City, Florida) |
| MSA | Morale Support Activities |
| MSA | Monang Sianipar Abadi (Indonesia freight company) |
| MSA | Manitoba Sheep Association, Inc (Manitoba, Canada) |
| MSA | Minimum Standard for Accreditation |
| MSA | Mobile Service Agent |
| MSA | Mine Safety Agency |
| MSA | Missile Storage Area |
| MSA | Mark Space Amplitude (electronics) |
| MSA | Maximum Security Area |
| MSA | Masters of Spatial Analysis |
| MSA | Master Stock Assortment |
| MSA | Municipal Services Association (British Columbia) |
| MSA | Makeshift Apathy |
| MSA | Multiple Scatterer Algorithm |
| MSA | Married Student Association (LDS church) |
| MSA | Montana Stockgrowers Association |
| MSA | Mississippi Society of Anesthesiologists |
| MSA | Michigan Society of Anesthesiologists, Inc. |
| MSA | Midwest Sign Association (Batavia, OH) |
| MSA | Manufacturing Service Agreement |
| MSA | Maritime SIGINT Architecture |
| MSA | Modular System Approach |
| MSA | Molloy Software Associates |
| MSA | Multiuse Solar Array |
| MSA | Michigan Sheriff Association |
| MSA | Mohair Council of America (San Angelo, Texas) |
| MSA | Mission Specific Application |
| MSA | Mean-Square Average |
| MSA | Main Support Area |
| MSA | Mobile Subscriber Access |
| MSA | Mission Support Aircraft |
| MSA | Multi-dimensional Systolic Array |
| MSA | Manpower Standard Application |
| MSA | Manpower Standard Application (Army) |
| MSA | Mission Support Analyst |
| MSA | Membrane Stabilizing Action (pharmacology) |
| MSA | Managed Services Architecture |
| MSA | Molino Santa Ana (Guatemala) |
| MSA | Meander-Sleeve Antenna |
| MSA | My Sainted Aunt (TV series) |
| MSA | Monthandler-Sammenslutningen (Karup, Denmark) |
| MSA | Maslov, Sokur and Associates |
| MSA | Major Support Area |
| MSA | Measure of Sampling Accuracy |
| MSA | Multisample Analysis |
| MSA | Military Satellite Communications Architecture |
| MSA | Memory Subassembly |
| MSA | Management Security Administrator |
| MSA | Materials Support Activity |
| MSA | Mono-Slot Antenna |
| MSA | Market Section Audiences |
| MSA | Missionary Sisters of Ajmeer |
| MSA | Mantenimiento y Servicios de Arquitectura (Spanish: Maintenance and Architectural Services; Guatemala) |
| MSA | Meritorious Service Award (Masons) |
| MSA | Maryland State Archives |
| MSA | Michican Skeet Association (est. 1965) |
| MSA | Magnet Schools of America (Texas) |
| MSA | Marketing Services Administrator (various companies) |
| MSA | Mediated Settlement Agreement |
| MSA | Market Square Arena |
| MSA | Merchant Shipping Act |
| MSA | Maritime Safety Authority (New Zealand) |
| MSA | Microsoft Access |
| MSA | Master of Science in Anesthesia (various schools) |
| MSA | Mobile Satellite Antenna (communications) |
| MSA | Mutualité Sociale Agricole (French: Agricultural Mutual Assistance Association) |