CIU

CIU may refer to:

• Crash Investigation Unit, an Australian factual television program
• Working Men's Club and Institute Union, an association of social clubs in the United Kingdom
• Chippewa County International Airport in Sault Ste. Marie, Michigan (IATA Code: CIU)
• Columbia International University, a Bible college and seminary in Columbia, South Carolina
• Cyprus International University, Cyprus, North Cyprus
• Cape plc, a construction company listed in the Alternative Investment Market under ticker CIU
• Customs and Immigration Union (Canada)
• Chronic idiopathic urticaria, also known as hives
• Collective investment undertaking, another term for an investment fund
• Conviction Integrity Unit, a division of a prosecutorial office, working to prevent, identify, and remedy false convictions
• Cédula de Identidad de Uruguay, the Uruguayan identity card
• Convergència i Unió, a Catalan political party