KZ

KZ or kz may stand for

* ISO 3166-1 alpha-2 country code and Internet TLD for Kazakhstan
* the IATA code for Nippon Cargo Airlines
* abbreviation of the German word "Konzentrationslager" (which is a literal translation of the English term "concentration camp")
* Kramme & Zeuthen, Danish aeroplane builders (see Skandinavisk Aero Industri)
* "Kuhns Zeitschrift", the former name of "Historische Sprachforschung", a journal of historical linguistics.