FISL
| Acronym | Definition |
|---|---|
| FISL | Fórum Internacional Software Livre (Portugese: International Free Software Forum) |
| FISL | Federal Insured Student Loan |
| FISL | Fidelity Investment Services Ltd. |
| FISL | Formation Internationale aux Sports de Loisirs (French: International Training for Sports Leisure) |
| FISL | Fund for International Service Learning (est. 2004) |
| FISL | FirstAssist Insurance Services Limited (UK) |
| FISL | Fidelity Investments Singapore Limited |