FDK or FdK stands for:
- Family Federation of Catholics
- Peace Association of German Catholics
- Covenant of peace, the war participants
- Conference of Cantonal Finance Directors and Finance Directors, an organization in the Swiss House of the Cantons
- FDK ( company ), a majority belonging to Fujitsu manufacturer of electrical components
- Of the Municipal Airport Frederick IATA code in Frederick (USA).
- Pirates of the Caribbean, American pirate film series of Walt Disney Pictures