| Acronym | Definition |
|---|
| CIU➣Convergència I Unió (Partit Polític de Catalunya-España) |
| CIU➣Columbia International University |
| CIU➣Cyprus International University (est. 1997) |
| CIU➣Common Interchange Unit |
| CIU➣Customer Interface Unit |
| CIU➣Chronic Idiopathic Urticaria |
| CIU➣Customs and Immigration Union (Canada) |
| CIU➣Central Interpretation Unit (UK) |
| CIU➣Criminal Intelligence Unit |
| CIU➣Crisis Intervention Unit |
| CIU➣Criminal Investigations Unit |
| CIU➣Computer Interface Unit |
| CIU➣Categorical Industrial User (industrial wastewater discharge and pretreatment) |
| CIU➣Center for International Understanding |
| CIU➣Confederazione Italiana Unionquadri (Italian confederation) |
| CIU➣Collective Investment Undertaking |
| CIU➣Communications Interface Unit |
| CIU➣Criminal Investigative Unit (police incident code; New Zealand) |
| CIU➣Clinical Investigation Unit |
| CIU➣Communications Intelligence Unit (various locations) |
| CIU➣Centre d'Information sur l'Urbanisme (French: Urban Planning Information Center) |
| CIU➣Club International Universitaire (French: International University Club; various locations) |
| CIU➣Centralized Intake Unit |
| CIU➣Canadian Institute of Underwriters |
| CIU➣Cable Interface Unit |
| CIU➣Channel Interface Unit |
| CIU➣Cockpit Interface Unit |
| CIU➣Central Interface Unit |
| CIU➣Continuous Improvement Unit (various locations) |
| CIU➣Controller Interface Unit |
| CIU➣Comitato Italiano per l'Unicef (Italian) |
| CIU➣Control Indicator Unit |
| CIU➣Camera Interface Unit |
| CIU➣Cryptologic Interface Unit |
| CIU➣Care Initiation Unit (various organizations) |
| CIU➣Community Information Utility (multimode network delivering information and entertainment) |
| CIU➣College Information Unit |
| CIU➣Crime Interdiction Unit |
| CIU➣Cell Interface Unit |
| CIU➣Converter Interface Unit |
| CIU➣Sault Ste Marie, MI, USA - Chippewa County International Airport (Airport Code) |
| CIU➣Central Injection Unit |
| CIU➣Client Interface Unit (connecting an antenna control unit to a host's control unit) |