| Acronym | Definition |
|---|
| FDN | Foundation |
| FDN | Fredonia (Amtrak station code; Fredonia, NY) |
| FDN | Functional Diagnostic Nutrition (certification course) |
| FDN | Family Dinner Night (various organizations) |
| FDN | Fault Discrimination Network |
| FDN | Fixed Dialing Numbers |
| FDN | Fully Distinguished Name |
| FDN | French Data Network (France; est. 1992) |
| FDN | Fixed Dialing Number (telecommunications) |
| FDN | Fuerza Democratica Nicaraguense (Nicaraguan Democratic Force) |
| FDN | Florida Digital Network |
| FDN | Freedom Data Networks (Hitachi) |
| FDN | Fichier Dosimétrique National (French: National Dose Registry; Canada) |
| FDN | Final Demand Notice (debt collection) |
| FDN | Fluor Daniel Northwest Inc. |
| FDN | Free Dialed Number |
| FDN | Future Digital Network |
| FDN | Fonds de Développement National (French: National Development Fund) |