KZ, K-Z, Kz, or kz may refer to:
Arts and media K-Z, a 1972 Italian documentary film Kuhns Zeitschrift, the former colloquial name for the linguistics journal Historische Sprachforschung KZ (KreedZ), a game mode in Counter-Strike
People KZ Okpala, American basketball player KZ Tandingan (born 1992), Filipino singer KZ, member of the Japanese music group Livetune
Places Ka'ba-ye Zartosht, or Kaabah of Zoroaster, a 5th-century BCE tower at Naqsh-e Rustam, an archaeological site in Iran Kazakhstan (ISO 3166 code: KZ) KidZania KZ, Konzentrationslager, the German term for Nazi concentration camps (1933–1945)
Transportation Nippon Cargo Airlines (IATA airline code: KZ) Kramme & Zeuthen, Danish aeroplane builders, see Skandinavisk Aero Industri Kuaizhou, a Chinese family of carrier rockets Toyota KZ engine, a diesel engine made for passenger cars
Other uses .kz, the Internet country code top-level domain for Kazakhstan kz (digraph), in Esperanto Angolan kwanza, the currency of Angola (symbol Kz) Korkine–Zolotarev lattice basis reduction algorithm Kolmogorov–Zurbenko filter KZ (Knowledge Zenith), a Chinese manufacturer of IEMs