CZ, C-Z, C/Z, or Cz may refer to:
Places
- Czech Republic (ISO 3166 country code <code>CZ</code>)
- .cz, internet country code top-level domain for the Czech Republic
- Casa Zimbabwe, a student housing unit in Berkeley, California, U.S.
- Canal Zone
People and characters
- Changpeng Zhao, co-founder and former CEO of cryptocurrency exchange Binance
- Cz, a character from Scrapped Princess
Businesses, groups, organisations
- C/Z Records, an American record label
- Česká zbrojovka firearms (ČZ)
- Česká zbrojovka Uherský Brod, a Czech firearms manufacturer
- CZ-USA, U.S. division
- Česká zbrojovka Strakonice (ČZ a.s.), a Czech manufacturer of forklifts and formerly motorcycles and firearms
- Crvena Zvezda, a Serbian football club
- Cizeta, an Italian car manufacturer named for its founder, Claudio Zampolli (C.Z.)
- China Southern Airlines (IATA airline code <code>CZ</code>)
Science, engineering, technology
- Cubic zirconia, a synthetic gemstone
- Haplogroup CZ (mtDNA), in human mitochondrial genetics
- Controlled Z gate, a type of Quantum logic gate
- Cz, an EEG electrode site according to the 10-20 system
Brands, products
- Long March (rocket family), or Chang Zheng
- Citizendium, an online encyclopedia project
Other uses
- Cz (digraph), in the Polish language
- CZ, vehicle registration prefix of Province of Catanzaro, Italy