GBZ is the call sign of a British VLF transmitter on 19.6 kHz from Anthorn, Cumbria (formerly from Criggion, Powys), which is involved with transmitting encrypted signals to submarines.
GBZ can refer to:
- GBZ, a British VLF transmitter used to transmit encrypted signals to submarines
- Centre for British Studies, Humboldt University of Berlin (German: Großbritannienzentrum)
- Gibraltar, as on vehicle registration plates
- Great Barrier Aerodrome, Great Barrier Island, New Zealand (IATA code)
- Dari (Zoroastrian), Northwest Iranian ethnolect (ISO 639-3 code)
- Guanabenz, by trade nameGBZ