BKL

BKL may mean:


 * Cleveland Burke Lakefront Airport, Ohio, United States
 * Big Kernel Lock, a Linux kernel mechanism
 * Berik, by ISO 639-3 language code - see ISO 639:b
 * BKL singularity, or Belinsky–Khalatnikov–Lifshitz singularity, a Universe evolution model
 * Bickley railway station, by station code
 * Bolshaya Koltsevaya line, a line of Moscow Metro
 * British Kabaddi League, a sports league