4K, 4-K or 4k may refer to:

  • 4000 (number)
  • Four kibibytes (4 × 1024 bytes, better written 4 KiB)
  • 4K disk sector size (Advanced Format)
  • 4K demoscene compo, a computer art competition using programs limited to 4 kibibytes
  • The Java 4K Game Programming Contest
  • 4K resolution, a collective term for digital video formats having a horizontal resolution of approximately 4,000 pixels
  • 4K UHDTV, an ultra-high-definition television format
  • 4K, the IATA airline code for Askari Aviation
  • 4K, an alternative name for Cuatro Cabezas (Four Heads), an Argentine multimedia production company.
  • 4K, model of Toyota K engine
  • 4K, the production code for the 1976 Doctor Who serial The Brain of Morbius
  • 4KScore test for prostate cancer screening
  • Kenn Borek Air, a Canadian airline IATA code

See also

  • 4000 (disambiguation)
  • KKKK (disambiguation)