GZ

GZ may stand for:
* Gaza Strip: FIPS PUB 10-4 territory code
* Ground Zero, in military parlance
* Guangzhou, China
* Air Rarotonga IATA airline designator
* Righting torque, righting arm or GZ acting to restore a tilting ship to the vertical — see metacentric height

gz may stand for:
* .gz, the file extension for gzip files (GNU zip, an open source file compression program)