FISN
| Acronym | Definition |
|---|---|
| FISN | Federazione Italiana Sci Nautico (Italian Water Ski Federation) |
| FISN | Federally Insured Savings Network |
| FISN | Fédération Internationale pour la Santé Naturelle (French: International Federation for Natural Health) |
| FISN | First Internet Securities Network (Bethesda, MD) |
| FISN | Financial Instrument Short Name (ISO 18774) |