| Acronym | Definition |
|---|
| FNS | Food and Nutrition Service (USDA) |
| FNS | Federated Naming Service |
| FNS | Fox News Sunday |
| FNS | Friday Night Skate |
| FNS | Fonds National Suisse (French: Swiss National Science Foundation) |
| FNS | Fédération Nationale de Simulation (French: National Federation of Simulation) |
| FNS | Fictitious Name Statement (law) |
| FNS | Female Non-Smoker |
| FNS | Federal News Service (Washington, DC) |
| FNS | Fitness Nutrition Specialist (National Academy of Sports Medicine) |
| FNS | Families in Need of Services (various locations) |
| FNS | Financial Network Services (Pty LTD) |
| FNS | Functional Neuromuscular Stimulation |
| FNS | Fonds National de Solidarité (French: National Solidarity Fund; various nations) |
| FNS | Friedrich Naumann Stiftung |
| FNS | First Nations Summit (Canada) |
| FNS | Fuji Network System (Japan) |
| FNS | Fonds National de la Science (France) |
| FNS | Formule Numération Sanguine (French: Blood Count Formula) |
| FNS | Familial Neonatal Seizures (epilepsy) |
| FNS | Field Naturalists' Society (various locations) |
| FNS | Foreign Nation Support |
| FNS | Far North Science (publication) |
| FNS | Force Net Supervisor (US Navy) |
| FNS | Finnish Navy Ship |
| FNS | Free Name System |
| FNS | Fantastic Network Solutions (Fort Lauderdale, Florida) |
| FNS | Flemingdon Neighbourhood Services (Toronto, Canada) |
| FNS | Functional Neuromuscular Stimulator |
| FNS | Frogans Network System |
| FNS | Federal Network Systems, Inc. |
| FNS | Frequency Notification System |
| FNS | French Nuclear Society |
| FNS | Faster-Than-Nyquist Signaling |