BZK or variant, may refer to:

Benzalkonium, a quaternary ammonium cation, frequently used as a biocidal cleanser

Groups and organizations Billy Ze Kick, a French rock band Ministry of the Interior and Kingdom Relations of the Netherlands (BZK; ), a government ministry BZK (cycling team), former name of the women's pro team Glas–Smurfit Kappa

Places Bryansk International Airport (IATA airport code: BZK; ICAO airport code: UUBP), Bryansk Oblast, Russia Bhaini Khurd station (rail code: BZK), Karnal, Haryana, India; a rail station, see List of railway stations in Haryana

Other uses Miskito Coast Creole (ISO 639 language code: bzk) BzK galaxy, a photometric galaxy classification BzK, a Czech artillery designation, see List of artillery by type BZK, a PRC military designation for UAVs, see List of unmanned aerial vehicles of China

See also