XZ, X.Z., or xz may refer to: xz, a lossless data compression file format based on the LZMA algorithm, often with the file extension ".xz" XZ Utils, a set of free lossless data compressors, including the command xz Yamaha XZ 550, a motorcycle produced c. 1982–1983 XZ Tauri, a binary star system in the constellation Taurus XZ, a type of PSA X automobile engine Tibet Autonomous Region, China (Guobiao abbreviation XZ)