ICI or Ici may mean:
- ICI programming language, a computer programming language developed in 1992
- Ici (magazine), an alternative weekly newspaper in Montreal, Canada
ICI is also an abbreviation which may mean:
- Imperial Chemical Industries, former British chemicals company
- Indian Concrete Institute
- Industrial, commercial, and investment real estate, or simply, commercial real estate
- Institute for Competitive Intelligence, a German post-graduate training organization
- Institute of Cultural Inquiry, an international organization functioning as a think-tank for artists
- Instituto de Cooperación Iberoamericana
- Inter Carrier Interface, A transport protocol (IANA port 2200) for use with SMDS.
- Inter-Channel-Interference
- Interface Control Information, a header used for layers in the OSI model
- Internal Control Institute, a professional certification in internal control
- International Commerce Institute, a high school in Phoenix, Arizona, United States
- International Commission on Illumination; more commonly abbreviated CIE, following its French spelling
- Interactive Compilation Interface - transforms production compilers into research toolsets
- Internet Computer Integration Project
- Intracervical Insemination
- Investment Company Institute, an American investment company trade organization
- Istanbul Cooperation Initiative, an initiative launched during NATO's 2004 Istanbul Summit
- Financing Instrument for Cooperation with Industrialised and Other High Income Countries and Territories, an instrument of the European Union
- International Compact with Iraq
- Independent Commercial Importer