| FDL | FAAD (Forward Area Air Defense) Data Link 
| Others |
| FDL | Facility Data Link
| Others |
| FDL | Failed Door Latch
| Others |
| FDL | Fast Deployment Logistics
| Others |
| FDL | Fat, Dumb, and Lazy
| Others |
| FDL | Feature Definition Language
| Others |
| FDL | Feature Description Language
| Others |
| FDL | Feature Detector Layer
| Others |
| FDL | FH DC and LBT
| Others |
| FDL | Fiber Delay Line
| Others |
| FDL | Field Definition Language
| Others |
| FDL | Fieldbus Data Link
| Others |
| FDL | Fierce Deity Link
| Others |
| FDL | Fighter Data Link
| Others |
| FDL | File Definition Language
| Others |
| FDL | Final Determination Letter
| Others |
| FDL | Finnish Defence League
| Others |
| FDL | Fleur De Lis
| Others |
| FDL | Flight Director Loop
| Others |
| FDL | Foam Dart Launcher
| Others |
| FDL | Folder Download Location
| Others |
| FDL | Fond du
| Others |
| FDL | Fond du Lac
| Others |
| FDL | Free Documentation License
| Others |
| FDL | Freedom, Diversity, and Love
| Others |
| FDL | Friendship Dedication Love
| Others |
| FDL | Frontier Development Lab
| Others |
| FDL | Fuel Diesel Locomotive
| Others |
| FDL | Full Dress Rehearsal
| Others |
| FDL | Full Dual Length
| Others |
| FDL | Fully Devoted to Life
| Others |
| FDL | Funny Dancing Lemons
| Others |
| FDL | Fusion Double Lens
| Others |