CIZ or Ciz or variants can refer to:
- Číž, a village in Slovakia
- Ciz (surname), a surname
- Coari Airport, an airport in Coari, Amazonas, Brazil
- Colegio Ignacio Zaragoza, a Roman Catholic school in Saltillo, Coahuila, Mexico, and one of the Lasallian educational institutions
- Cumulative Impact Zones, a kind of zone related to the Licensing Act 2003 in the United Kingdom
- Ciz (Korean: 씨즈), a contestant in Be Mbitious
- Chizhou, a city in Anhui, China
- ZNF384, a protein-coding gene