Businesses and organizations
* 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 inhibitorsOther 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 *