BJK or Beşiktaş JK is a Turkish sports club.

BJK or bjk may also refer to:

• Benjina-Nangasuri Airport, Maluku, Indonesia (IATA code: BJK)
• Barok language of New Ireland, PNG (ISO code: bjk)
• Big Jock Knew, Scottish football chant
• Billie Jean King, American tennis player
  • USTA Billie Jean King National Tennis Center

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