BGK may refer to:
Commerce Bank Gospodarstwa Krajowego, a Polish bank The ISO 4217 code for the second Bulgarian lev
Music Beyoncé Giselle Knowles, an American singer
Science Bernstein–Greene–Kruskal modes, a type of nonlinear electrostatic wave that propagates in a collisionless plasma Bhatnagar–Gross–Krook operator, a collision operator used in Lattice Boltzmann methods BgK, a neurotoxin found within the mucous secretions of sea anemones
Sports Barangay Ginebra Kings, a professional Philippine basketball team