| FN | File Number | 文件号, 档案号 |
| FN | Fiber Node | 光纖投落點 |
| FN | Functional Network | 功能网络 |
| FN | Frame Number | 帧号, 帧序号 |
| FN | Family Night | 家庭之夜 |
| FN | Frequency and Number | 频率和数量 |
| FN | Fiscal Note | 财政票据 |
| FN | Fighter Naval | 海军战斗机 |
| FN | Field Number | 字段编号 |
| FN | FundaciÓn Natura | FundaciÓn Natura |
| FN | Force Network | 强制网络 |
| FN | Fabrique National | 法布里克国家队 |
| FN | Fingerprint Number | 指纹号码 |
| FN | Frans Noltee | 弗朗斯·诺尔特 |
| FN | Fowler Nordheim | Fowler Nordheim公司 |
| FN | Forest News | 森林新闻 |
| FN | Forum Notice | 论坛通知 |
| FN | Fuerzas Navales | Fuerzas Navales公司 |
| FN | Factory New | 工厂新建 |
| FN | Fireman (Navy) | 消防员（海军） |
| FN | Fakultetsnämnden (Swedish: Faculty Board) | Fakultetsnämnden (Swedish: Faculty Board) |
| FN | Fuzzy Navel (cocktail) | Fuzzy Navel（鸡尾酒） |
| FN | File Name | 文件名 |
| FN | factor N | 因子N |
| FN | Food Network (TV channel) | 美食网（电视频道） |
| FN | formol nitrogen | 甲醛氮 |
| FN | facial nucleus | 面部核 |
| FN | Finding Nemo (movie) | 海底总动员（电影） |
| FN | fluoride number | 氟化物值 |
| FN | Focus Now (Texarkana, Texas) | 立即关注（德克萨斯州德克萨斯州） |
| FN | fastigii nucleus | 顶核 |
| FN | Feliz Navidad (Spanish: Merry Christmas) | 费利兹·纳维达德（西班牙语：圣诞快乐） |
| FN | fibrinoid necrosis | 纤维蛋白样坏死 |
| FN | finger-to-nose | 手指到鼻子 |
| FN | flow number | 流量编号 |
| FN | facial nerve | 面神经 |
| FN | False Negatives | 漏报 |
| FN | Fuerza Nueva | Fuerza Nueva公司 |
| FN | Fowler-Nordheim (electronics) | Fowler Nordheim（电子） |
| FN | Future Navy | 未来海军 |
| FN | Fabrique National (arms maker and its rifles) | Fabrique National（武器制造商及其步枪） |
| FN | Flat Nose (bullet) | 平头（子弹头） |
| FN | Fernando de Noronha (Brazil) | 费尔南多·德诺罗尼亚（巴西） |
| FN | Fight Night (video game) | 战斗之夜（视频游戏） |
| FN | False Negative | 假阴性 |
| FN | Forces Nouvelles (Côte d'Ivoire) | Forces Nouvelles (Côte d'Ivoire) |
| FN | Fully Non-Reciprocal Method | 完全非倒数法 |
| FN | Forente Nasjoner (UN) | Forente Nasjoner（联合国） |
| FN | Fireman (USCG, USN) | 消防员（USCG、USN） |
| FN | FORCEnet (US Navy) | FORCEnet（美国海军） |
| FN | Folder Navigation | 文件夹导航 |
| FN | Function (keyboard key, BASIC keyword) | 功能（键盘键，BASIC关键字） |
| FN | Foreign National | 外国国民 |
| FN | Find Number | 查找编号 |
| FN | First Notice | 首次通知 |
| FN | Fragged Nation (gaming website) | 脆弱的国家（游戏网站） |
| FN | Faith Networks | Faith Networks公司 |
| FN | First Nation | 第一民族 |
| FN | First Name | 名字 |
| FN | First Night | 第一晚 |
| FN | Financial Network | 金融网络 |
| FN | Flight Nurse | 飞行护士 |
| FN | Forenede Nationer (Danish: United Nations) | Forenede Nationer（丹麦语：联合国） |
| FN | Fog Nozzle | 雾化喷嘴 |
| FN | FileNet | 文件网 |
| FN | Front National | 国民阵线 |
| FN | Footnote | 脚注 |
| FN | Fibronectin | 纤维连接蛋白 |
| FN | Financial News | 财经新闻 |