CIU may refer to:
Ciudad Juárez (Spanish pronunciation: [sjuˈðað ˈxwaɾes], /ˈhwɑːrɛz/ WHAH-rez; Juarez City) is a city in the Mexican state of Chihuahua.
Ciudad Real is one of the 52 electoral districts (circunscripciones) used for the Spanish Congress of Deputies - the lower chamber of the Spanish Parliament, the Cortes Generales.
Ciudad Obregon (Spanish pronunciation: [sjuˈðað oβɾeˈɣon]) is the second largest city in the northern Mexican state of Sonora and named for Sonoran revolutionary general and president of Mexico, Álvaro Obregón.
Ciudad Bolívar (Spanish pronunciation: [sjuˈðað βoˈliβar]; Spanish for "Bolivar City"), formerly known as Angostura, is the capital of Venezuela's southeastern Bolívar State.
Ciudad Nezahualcóyotl (Spanish pronunciation: [sjuˈðað nesawalˈkoʝotɬ]), or more commonly Ciudad Neza, is a city and municipality of State of Mexico adjacent to the northeast corner of Mexico City: it is thus part of the Mexico City Metropolitan Area.
La Ciudad de las Ideas (CDI) is a conference created by Andrés Roemer, to empower citizens and present innovative ideas in science, technology, art, design, politics, education, culture, business, entertainment and other areas of knowledge.
Ciudad del Este (Spanish pronunciation: [sjuˈðað ðel ˈeste], Spanish for City of the East) initialed CDE is the second largest city in Paraguay and capital of the Alto Paraná Department, situated on the Paraná River.
Ciudad Victoria ( sjuˈðad bikˈtoɾja ), is the capital city of the Mexican state of
Ciudad de las Ideas (City of Ideas) is an album released by Spanish performer Vicente Amigo in February 26, 2002. The album earned Amigo a Latin Grammy Award nomination for Album of the Year[I] and won Best Flamenco Album.