FDK may refer to:
- Fortress Division Kreta, temporary designation of 164th Infantry Division (Wehrmacht), a World War II German Army unit
- Fraunhofer FDK AAC, an audio codec
- Adobe Font Development Kit for OpenType, a set of tools for editing and verifying OpenType fonts
- FDK Corporation, a manufacturer of batteries, majority belonging to Fujitsu
- FDK, ICAO code for FlyDamas, a Syrian airline
- FDK, IATA code for Frederick Municipal Airport (Maryland), in the US
- "F.D.K. (Fearless Doctor Killers)", a song on the Mudhoney album My Brother the Cow
- Fdk., abbreviation for the hybrid orchid genus Fredclarkeara
- FDK, also refers to Firmware Development Kit in the Embedded System
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