FSA stands for:

• Fabless Semiconductor Association
• Faculté des Sciences de l'Administration (Faculty of Business Studies) - Laval University
• Farm Security Administration - United States
• Farm Service Agency - United States
• Federal Security Agency - United States
• Federal Student Aid - United States
• Federation of South Arabia - organization of former British-protected states, now part of Yemen
• Fellow of the Society of Actuaries
• Fellow of the Society of Antiquaries
• Financial Security Assurance, Inc, an American monoline insurance company.
• Financial Services Agency - Japanese regulator
• Financial Services Authority - United Kingdom regulator
• Finite State Automaton
• Firm Specific Advantage - A term used in International Business literature
• Flexible spending account - employee benefit plan
• Flight Schedule Analyzer
• Florida Student Association
• Flying Saucer Attack - band
• Food Standards Agency - United Kingdom
• Formal Safety Assessment - a risk assessment methodology proposed and promoted by the International Maritime Organization
• Forward Sortation Area - First three characters of a Canadian postal code. Last three characters are the Local Delivery Unit (LDU).
• The Legend of Zelda: Four Swords Adventures
• Free Spirit Alliance - United States
• FSA Corporation (formerly Freedman, Sharp, and Associates)

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