| Acronym | Definition |
|---|
| FNAS | Fonds National d'Activités Sociales (French: National Fund for Social Activities; Paris, France) |
| FNAS | Fédération Française des Négociants en Appareils Sanitaires (French: French Federation of Sanitary Appliance Traders) |
| FNAS | Federazione Nazionale Arte di Strada (Italian: National Federation of Street Arts) |
| FNAS | Fonds National d'Action Sociale (French: National Social Action Fund) |
| FNAS | Fine-Needle Aspiration Specimens |
| FNAS | Fidelity National Agency Solutions (title insurance; Plano, TX) |
| FNAS | Faculty of Natural and Applied Sciences (Trinity Western University; Canada) |