| FDL | Fiber Delay Line | 光纤延迟线 |
| FDL | Freedom, Diversity, and Love | 自由、多样性和爱 |
| FDL | Fully Devoted to Life | 全身心投入生活 |
| FDL | FireDogLake (website) | FireDogLake（网站） |
| FDL | Fat, Dumb, and Lazy | 胖、笨、懒 |
| FDL | Fighter Data Link | 战斗机数据链路 |
| FDL | Field Definition Language | 字段定义语言 |
| FDL | Flight Dynamics Laboratory | 飞行动力学实验室 |
| FDL | Faculdade de Direito de Lisboa (Lisbon Law School; Portugal) | 葡萄牙里斯本法学院 |
| FDL | Forms Definition Language | 表单定义语言 |
| FDL | FAAD ( Forward Area Air Defense) Data Link | FAAD（前沿防空）数据链路 |
| FDL | Feature Description Language | 功能描述语言 |
| FDL | Funny Dancing Lemons | 有趣的跳舞柠檬 |
| FDL | Forensic Document Lab | 法医文件实验室 |
| FDL | Free Documentation License | 免费文档许可证 |
| FDL | Flexor Digitorum Longus | 手指长屈肌 |
| FDL | Focus Design Location | 焦点设计位置 |
| FDL | Fieldbus Data Link | 现场总线数据链路 |
| FDL | Flight Deck Lighting (US Navy) | 飞行甲板照明（美国海军） |
| FDL | Fast Deployment Logistics | 快速部署后勤 |
| FDL | Facilities Data Link | 设施数据链接 |
| FDL | Fond du Lac (Wisconsin, US) | Fond du Lac（美国威斯康辛州） |
| FDL | File Definition Language | 文件定义语言 |
| FDL | Facility Data Link | 设施数据链接 |
| FDL | Fall Down Laughing | 摔倒大笑 |
| FDL | Forward Defended Localities | 前方防御地点 |
| FDL | FAAD Data Link | FAAD数据链路 |
| FDL | Final Determination Letter | 最终决定书 |
| FDL | Failure Derivation Location | 故障衍生位置 |
| FDL | Forum on Specification, Verification and Design Languages | 规范、验证和设计语言论坛 |
| FDL | Finite Distributed Lag | 有限分布滞后 |
| FDL | Fermentation Development Laboratory | 发酵发展实验室 |