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CIU may refer to:

  • Cédula de Identidad de Uruguay, the Uruguayan identity card
  • Convergència i Unió, a Catalan political party
  • Crash Investigation Unit, an Australian factual television program
  • Working Men's Club and Institute Union, a group of 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 AIM under ticker CIU
  • Customs and Immigration Union (Canada)
  • Chronic idiopathic urticaria, also known as hives