BK
BK or Bk may refer to:

Businesses and organizations
Burger King, a chain of fast food restaurants
The Bank of New York Mellon, the New York Stock Exchange symbol for The Bank of New York Mellon Corporation (NYSE:BK)
Brahma Kumaris, a religious movement
British Knights, a manufacturer of athletic shoes
Federal Criminal Police Office (Austria) (Bundeskriminalamt), a federal police force
Okay Airways (IATA airline code BK)

Science and technology
BK channel, an ion channel characterized by its large conductance of potassium ions through cell membranes
BK virus, a member of the polyomavirus family
Berkelium (Bk), a chemical element
Elektronika BK, a series of 16-bit PDP-11-compatible Soviet home computers developed by NPO Scientific Center
Bordkanone, an aircraft cannon
Brother's Keeper (software), a genealogy software program
TU Delft Faculty of Architecture (Dutch: Faculteit Bouwkunde)
Bradykinin, a peptide targeted by ACE inhibitors

Other uses
B.K. Cannon, (born 1990), actress from Hawaii, USA
BK (musician), (born 1973), the working name of the English hard house producer Ben Keen
BK Racing, a former NASCAR team
Bankruptcy, a legal status of a person or other entity that cannot repay debts
Bosnia and Herzegovina (FIPS 10-4 country code BK)
Brooklyn, a borough of New York City
Banjo-Kazooie, a series of video games

See also
B&K (disambiguation)