FISA may refer to:
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- Fédération Internationale des Sociétés Aérophilatéliques or International Federation of Aerophilatelic Societies
- Fédération Internationale des Sociétés d'Aviron or the International Federation of Rowing Associations, the governing body for international rowing
- Fédération Internationale du Sport Automobile, historically a subsidiary body of the FIA
- Federation of Irish Scouts Associations, a member of the World Organisation of the Scout Movement which comprised Scouting Ireland (CSI), Scouting Ireland S.A.I. and the Scout Association of Northern Ireland.
- Financial Information Services Agency, an agency of New York City that provides payroll, budget, accounting, and human resource data for all New York City agencies.
- Fibras Industriales S.A., a fishing net, rope, twine, float and pp bag manufacturer in Lima, Peru
- Federation of Indian Student Associations in Australia, an umbrella body of Indian Students Associations in Australia.
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