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)
 * Metal Gear Solid V: Ground Zeroes, a 2014 video game