GZ

GZ or gz may refer to:

• .gz, the file extension for gzip files (GNU zip, an open source file compression program)
• GZ, an HCPCS Level II modifier meaning an item or service is expected to be denied as not reasonable or necessary
• GZ, the "righting moment" or "righting arm" acting to restore a tilting ship to vertical; see metacentric height
• Galaxy Zoo, a crowdsourced astronomy project
• Gaza Strip (FIPS PUB 10-4 territory code)
• Gestrichener Zellstoffkarton (German; DIN 19303 Code), a grade of paperboard also known as solid bleached board
• Ground Zero, in military parlance
• Guangzhou, capital and largest city of Guangdong Province in southeastern China
• Guizhou, a province of China (Guobiao abbreviation GZ)
• Air Rarotonga (IATA airline designator)