| Acronym | Definition |
|---|
| FASI | Fonds d'Appui au Secteur Informel (French: Fund Informal Sector Support; Burkina Faso) |
| FASI | Federazione Arrampicata Sportiva Italiana (Italian: Italian Rock Climbing Federation; Bologna, Italy) |
| FASI | Fondo Assistenza Sanitaria Integrativa (Rome, Italy) |
| FASI | Federasi Aero Sport Indonesia (Indonesian: Indonesian Aerosport Federation) |
| FASI | Field-Amplified Sample Injection |
| FASI | Fill Area Style Index |
| FASI | Fellow of the Architecture and Surveying Institute (UK) |
| FASI | Field-Amplified Stacking Injection |