KDF may refer to:
- K47DF, a low-power television station in Corpus Cristi, Texas which brands as KDF
- KDF Energy
- KDF9 British computer by English Electric
- Kerala Dalit Federation
- Key derivation function, deriving secret keys from a secret value such as a master key, a password or passphrase using a pseudo-random function
- Kraft durch Freude (Strength Through Joy), a large state-controlled leisure organization in Nazi Germany
- Kenya Defence Forces, the organized military of Kenya
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