IZ, Iz, or iZ may refer to:
- Arkia (IATA code: IZ), an Israeli airline
- Immobilien Zeitung, a weekly specialist journal for the German real estate industry
- Inclusionary zoning, an American term which refers to municipal and county planning ordinances
- International zone, a type of extraterritoriality governed by international law
- Invader Zim, an American animated television series
- Iraq (NATO country code: IZ), a country in Western Asia
- IZ (YouTuber), a Mongolian YouTuber
- Israel Kamakawiwoʻole (also called "Bruddah Iz"; 1959–1997), Hawaiian musician, entertainer and Hawaiian sovereignty activist
- IZ (band), a Korean rock band
- Iž, an island in the Zadar Archipelago
- iZ (toy), an electronic musical toy released EmpiresBritish