FDNS
| Acronym | Definition |
|---|---|
| FDNS | Fraud Detection and National Security |
| FDNS | Front de Défense des Non-Syndiqué-es (French: Front for the Defence of Non-Unionized Workers; Canada) |
| FDNS | Finite-Difference Navier Stokes (code) |
| FDNS | Fighting Dems News Service |
| FDNS | Fast Domain Name Service (computing) |
| FDNS | Frontul Democrat al Salvarii Nationale (Romanian: Democratic National Salvation Front) |