BJK or Beşiktaş J.K. 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