FNFI
| Acronym | Definition |
|---|---|
| FNFI | Fiesta Nacional del Fútbol Infantil (Spanish: National Children's Football Festival; Argentina) |
| FNFI | First Niles Financial, Inc. (Niles, OH) |
| FNFI | First Nations Fiscal Institutions (Ottawa, Ontario, Canada) |
| FNFI | Facial Nerve Function Index |