FNS
- FN (disambiguation)
- FN FNS
- Factorial number system
- Federal News Service
- Federal Taxation Service
- Federated Naming Service
- Finnish Navy Ship
- Fire and Skoal
- Food Network Star
- Food and Nutrition Service
- Fox News Sunday
- Frontier Nursing Service
- Fuji Network System
- National Salvation Front (Russia)
- Swiss National Science Foundation
- WWE Friday Night SmackDown