BK may stand for:

Most commonly:

• Burger King

Others:

• Banjo-Kazooie (video game)
• Bankruptcy
• Battery Captain (UK)
• Beekeeper
• Below knee (amputation)
• Berkelium
• Bible Knowledge
• Blitzkrieg (game)
• Book
• Bosnia and Herzegovina
• Brinkman-Kramers
• British Knights
• Brooklyn
• Bruel & Kjaer (bk.dk)
• Bundeskanzler (Germany)
• Beverley Knight
• BlueKaffee