Finite State Automaton

Flexible spending account - employee benefit plan

Federal Student Aid - United States Department of Education

Freedman, Sharp, and Associates

FSA Corporation

Fellow of the Society of Actuaries

Formal Safety Assessment - a risk assessment methodology proposed and promoted by the IMO

Flying Saucer Attack - band

Fellow of the Society of Antiquaries

Farm Service Agency - United States

Federal Security Agency - United States

Full Speed Ahead - bicycle component manufacturer

Farm Security Administration - United States

Federation of South Arabia - British protected state now part of Yemen

Financial Services Agency - Japanese regulator

Financial Services Authority - British regulator

Food Standards Agency - United Kingdom

Free Spirit Alliance - United States

The Legend of Zelda: Four Swords Adventures - a video game

Financial Security Assurance, Inc. - United States, a monoline insurance company.

Forward Sortation Area - First three characters of a Canadian postal code. Last three characters are the Local Delivery Unit LDU.