MSSA

MSSA may refer to:

• Methicillin-sensitive Staphylococcus aureus, a type of bacteria
• MSSA Chemical company, a French chemical company, also known as Métaux Spéciaux
• Military-style semi-automatic, a firearm (abbreviation commonly used in New Zealand)
• Member of the Order of the Star of South Africa
• The Montessori School of San Antonio, a Montessori school in San Antonio, Texas
• The Military Selective Service Act, a law establishing the current Selective Service System in the United States
• Maryland Saltwater Sportfishing Association, an organization in the state of Maryland of recreational anglers and conservationists
• MSSA Medical Service study Area, are sub-city and sub-county geographical units used to organize and display population, demographic and physician data. MSSAs were developed in 1976 by the California Healthcare Workforce Policy Commission (formerly California Health Manpower Policy Commission) to respond to legislative mandates requiring it to determine "areas of unmet priority need for primary care family physicians" (Song-Brown Act of 1973) and "geographical rural areas where unmet priority need for medical services exist" (Garamendi Rural Health Services Act of 1976).