ICZ may refer to:
-icz, Polish for "son of"; see Family name affixes iCZ technology, used in Babicz Guitars Indolocarbazole International Congress of Zookeepers International Construction Zimbabwe, division of Murray & Roberts; see Manyuchi Dam Intertropical Convergence Zone, or the doldrums, a windless area of the Earth Israelitische Cultusgemeinde Zürich (ICZ), the largest Jewish community of Switzerland