| FNS | A Federated Naming Service 
| Others |
| FNS | f Number Siblings
| Others |
| FNS | Fade NonStop
| Others |
| FNS | FDDI Network Services
| Others |
| FNS | Fecal Neutral Steroids
| Others |
| FNS | Federal Network Systems
| Others |
| FNS | Federal News Service
| Others |
| FNS | Federated Naming Service
| Others |
| FNS | Fine Non Sandy
| Others |
| FNS | Finite Nuclear Size
| Others |
| FNS | Finnish Navy Ship
| Others |
| FNS | Fitness Never Sleeps
| Others |
| FNS | Fitness Nutrition Specialist
| Others |
| FNS | Fitness Nutrition Specialization
| Others |
| FNS | Flared Nostril Syndrome
| Others |
| FNS | Flemingdon Neighbourhood Services
| Others |
| FNS | Flexyx Neurotherapy System
| Others |
| FNS | Florida Neurosurgical Society
| Others |
| FNS | Follicle Nutrient System
| Others |
| FNS | Food and Nutrition Sciences
| Others |
| FNS | Food and Nutrition Service
| Others |
| FNS | Food and Nutrition Services
| Others |
| FNS | Food n Stuff
| Others |
| FNS | Ford Navigation System
| Others |
| FNS | Foreign Nation Support
| Others |
| FNS | Frazer Nash
| Others |
| FNS | Friday Night Skate
| Others |
| FNS | Friday Night Society
| Others |
| FNS | Friday Night Stupidity
| Others |
| FNS | Friedrich Nietzsche Society
| Others |
| FNS | Friendly Neighborhood Search
| Others |
| FNS | Frogans Network System
| Others |
| FNS | Frontier Nursing Service
| Others |
| FNS | Fuji Network System
| Others |
| FNS | Fundamental Numerical Scheme
| Others |