| Acronym | Definition |
|---|
| FNI | Fichier National des Immatriculations (French: National File of Registrations) |
| FNI | Fonds National d'Investissement (French: National Investment Fund; Algeria) |
| FNI | Forces Nucléaires à Portée Intermédiaire (French: Intermediate Range Nuclear Forces; treaty) |
| FNI | Fridtjof Nansen Institute (Norway) |
| FNI | Financial Network Inc (St Louis, MO) |
| FNI | Florey Neuroscience Institutes (Melbourne, Australia) |
| FNI | Fédération Nationale des Infirmières |
| FNI | Fundamental Networks, Inc (Dallas, TX) |
| FNI | Fellow of the Nautical Institute |
| FNI | Filii Nigrantium Infernalium (band) |
| FNI | Fiber Network Identification |
| FNI | First Net Impressions (Eau Claire, WI) |
| FNI | First Node Implementation |
| FNI | Following Named Individuals |
| FNI | Foreign National Indirect |
| FNI | Freelancer News International (UK, India and USA youth journalism effort) |
| FNI | Future Now Industries (Suzhou, China) |