ICA, Ica, or ica may refer to:
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ICA,
ica, or
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- Empresas ICA, a Mexican construction company
- ICA AB, a Swedish retail food business, formerly named ICA Ahold AB
- Indoor Cricket Australia
- Informatics Corporation of America, a private health information technology company
- Innovative Communications Alliance, between Microsoft and Nortel
- Institute of Combinatorics and its Applications, in Winnipeg, Canada
- Institute of Cultural Affairs International, an international non-profit organization
- Insulation Council of Australia and New Zealand, an industry trade group
- Interbank Card Association, now known as Mastercard
- Interfaculty Committee Agraria, an association of over 60 biological science universities
- Intermuseum Conservation Association
- ICA AG [ru], Internationale Camera Actiengesellschaft, German camera maker that became Zeiss Ikon
- International Cartographic Association
- International Chiropractors Association
- International Clarinet Association
- International Co-operative Alliance, the worldwide umbrella body for co-operatives
- International Commission for Acoustics
- International Communication Association
- International Congress of Actuaries
- International Congress of Americanists
- International Cooperation Administration, a United States government agency concerned with international development
- International Council on Archives
- Irish Citizen Army, an organization which lasted up to 1916 to rid Ireland of British rule
- Irish Countrywomen's Association
- Islamic Cultural Association (Hong Kong)
- ICa (card), a smart card ticketing system for public transport in Kanazawa, Japan
- Ica language, a Magdalenic Chibchan language
- International Contract Agency, a fictional contract killing organization in the Hitman video game franchise
- Islet cell antibodies test, a test for latent autoimmune diabetes