| Acronym | Definition |
|---|
| FNN | Feed-Forward Neural Network (semiconductors) |
| FNN | Finance News Network (Australia) |
| FNN | Financial News Network |
| FNN | Fuzzy Neural Network |
| FNN | Fox News Network |
| FNN | Fédération Française de Naturisme (French: French Federation of Naturism) |
| FNN | Fédération Nationale des Négociants en Bois (French: National Federation of Wood Traders; Belgium) |
| FNN | Flat Neighborhood Network |
| FNN | Full National Number (all digits of a telephone number) |
| FNN | Farmer and Nature Net |
| FNN | Fundación Nicaragua Nuestra (Spanish: Our Foundation Nicaragua) |
| FNN | Funkeln Nagel Neu (band) |
| FNN | Future Network News |