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