BDK may refer to:

  • Base Derivation Key, the key used jointly by the PIN Pads and your jPOS implementation to create and transport DUKPT-enabled PIN blocks.
  • Bruderschaft des Kreuzes, a professional wrestling stable in Chikara
  • Bundu dia Kongo, a politico-religious group in Bas Kongo, Democratic Republic of the Congo
  • Big Daddy Kane, an American rapper.
  • Quebec comics, called by some in the 1970s Bande dessinée kébécoise