| F&N | Food and Nutrition 
| Others |
| FN | Fabrique National
| Others |
| FN | Fabrique Nationale
| Others |
| FN | Face Number
| Others |
| FN | Factory New
| Others |
| FN | Fake Number
| Others |
| FN | False Negative
| Others |
| FN | Family Neglect
| Others |
| FN | Family Night
| Others |
| FN | Fast Note
| Others |
| FN | Fibonacci Number
| Others |
| FN | Field Number
| Others |
| FN | Fighter Naval
| Others |
| FN | Figure Name
| Others |
| FN | File Name
| Others |
| FN | Filter Nucleic
| Others |
| FN | Financial News
| Others |
| FN | Fine Noon
| Others |
| FN | Fingerprint Number
| Others |
| FN | Fireman
| Others |
| FN | First Nation
| Others |
| FN | First Nations
| Others |
| FN | First Number
| Others |
| FN | Fiscal Note
| Others |
| FN | Flat Nose
| Others |
| FN | Fonar Night
| Others |
| FN | Food Network
| Others |
| FN | Footnote
| Others |
| FN | Footsoldier Number
| Others |
| FN | for an
| Others |
| FN | for Ana
| Others |
| FN | For Non
| Others |
| FN | For Now
| Others |
| FN | For the Nth
| Others |
| FN | For The Number
| Others |
| FN | Force Network
| Others |
| FN | Fore Noon
| Others |
| FN | Foreign Nation
| Others |
| FN | Foreign National
| Others |
| FN | Forest News
| Others |
| FN | Formatted Name
| Others |
| FN | Formula Nippon
| Others |
| FN | Fortnightly
| Others |
| FN | Fortnite
| Others |
| FN | Forum Notice
| Others |
| FN | Fowler Nordheim
| Others |
| FN | Fragmentary Network
| Others |
| FN | Frank Nathan
| Others |
| FN | Frans Noltee
| Others |
| FN | Fratelli Nistri
| Others |
| FN | Freaking News
| Others |
| FN | Freedom Ninja
| Others |
| FN | Frequency and Number
| Others |
| FN | Friday Night
| Others |
| FN | Friends and Neighbors
| Others |
| FN | FrivolousNecessity (pattern maker)
| Others |
| FN | Front National
| Others |
| FN | Fuerza Nueva
| Others |
| FN | Fuerzas Navales
| Others |
| FN | Function Name
| Others |
| FN | Function Numbering
| Others |
| FN | Funeral Notice
| Others |
| FN | Future Networks
| Others |