GBZ

GBZ may refer to:
 * Criggion Radio Station, a defunct British VLF transmitter
 * Centre for British Studies (German: Großbritannienzentrum), Humboldt University of Berlin
 * Great Barrier Aerodrome, on Great Barrier Island, New Zealand
 * Guanabenz, an antihypertensive drug
 * The international vehicle registration code for Gibraltar
 * Zoroastrian Dari language