| Acronym | Definition |
|---|
| FN | Foreign |
| FN | Food Network (TV channel) |
| FN | Finance |
| FN | Front National |
| FN | Finish |
| FN | Function (keyboard key, BASIC keyword) |
| FN | Factory New |
| FN | Financial News |
| FN | First Name |
| FN | First Nation |
| FN | Footnote |
| FN | Food and Nutrition (academic courses) |
| FN | Fight Night (video game) |
| FN | False Negative |
| FN | Fibronectin |
| FN | File Number |
| FN | Fireman (Navy) |
| FN | Fireman (USCG, USN) |
| FN | Fabrique Nationale de Herstal (Belgian firearms manufacturer) |
| FN | Formula Nippon (Japan) |
| FN | Forenede Nationer (Danish: United Nations) |
| FN | First Night |
| FN | Forces Nouvelles (Côte d'Ivoire) |
| FN | Forente Nasjoner (UN) |
| FN | Financial Network |
| FN | Feliz Navidad (Spanish: Merry Christmas) |
| FN | First Notice |
| FN | Fabrique National (arms maker and its rifles) |
| FN | Fernando de Noronha (Brazil) |
| FN | Febrile Neutropenia |
| FN | FileNet |
| FN | Foreign National |
| FN | Finding Nemo (movie) |
| FN | Fowler-Nordheim (electronics) |
| FN | Flat Nose (bullet) |
| FN | Functional Description |
| FN | Feistel Network |
| FN | Fracture Numérique (French: Digital Divide) |
| FN | Find Number |
| FN | Focus Now (Texarkana, Texas) |
| FN | Flight Nurse |
| FN | Froude Number |
| FN | Forced Normalization |
| FN | Fakultetsnämnden (Swedish: Faculty Board) |
| FN | Fundación Natura (Spanish: Nature Foundation) |
| FN | FORCEnet (US Navy) |
| FN | Fuzzy Navel (cocktail) |
| FN | Fog Nozzle |
| FN | Future Navy |
| FN | Folder Navigation |
| FN | Fragged Nation (gaming website) |
| FN | Faith Networks |
| FN | Fully Non-Reciprocal Method |