CZ (and variants) is an acronym or abbreviation for:

  • Cubic zirconia, a common simulation diamond
  • Czech Republic, ISO 3166 and obsolete NATO digram
  • Česká Zbrojovka (meaning Czech Armory), trade name of the Czechoslovak firearms manufacturers and state arsenal
  • Česká Zbrojovka Uhersky Brod (ČZUB), a Czech firearms manufacturer. (Formerly Československá Státní Zbrojovka Brno, the main Czechoslovak firearms manufacturer at Brno before World War II)
  • Česká Zbrojovka Strakonice, a Czech firearms and motorcycle manufacturer
  • CZ-USA US division of Česká Zbrojovka Uherský Brod, a Czech firearms manufacturer
  • Crvena Zastava, Serbian arms and automotive manufacturers now known as Zastava Arms
  • China Southern Airlines (IATA airline designator], an international airline based in Guangzhou, People's Republic of China
  • Counter-Strike: Condition Zero, a 2004 computer game in the Counter-Strike series from Vivendi Universal
  • Casa Zimbabwe, a house of some fame in the UC Berkeley University Students' Cooperative Association
  • Citizendium, an online encyclopedia project
  • C/Z Records, a record label
  • Claudio Zampolli's initials, when pronounced (in Italian) it sounds like Cizeta
  • Haplogroup CZ, mitochondrial DNA
  • Province of Catanzaro
  • A digraph of the Polish language, see Cz (digraph)
  • Convergence zones of sonar; see Sound propagation
  • Canal Zone (disambiguation)
  • Chang Zheng, a Chinese family of rockets, see Long March (rocket family)

Cz may refer to:

  • Cz, a Peacemaker in the Japanese light novel series and anime Scrapped Princess