ICA
- Association for European Life Science Universities
- Empresas ICA
- Hitman (franchise)
- ICA AB
- ICa (card)
- Ica Province
- Ica Region
- Ica River
- Ica language
- Ica, Peru
- Immaculate Conception Academy
- Immaculate Conception Academy (disambiguation)
- Immigration and Checkpoints Authority
- Impoundment Control Act of 1974
- Independent Computing Architecture
- Independent component analysis
- Indoor Cricket Australia
- Informatics Corporation of America
- Innovative Communications Alliance
- Institute of Combinatorics and its Applications
- Institute of Contemporary Art (disambiguation)
- Institute of Contemporary Arts
- Institute of Cultural Affairs International
- Instituto Coreano Argentino
- Insulation Council of Australia and New Zealand
- Interconnect agreement
- Intercontinental A
- Intermuseum Conservation Association
- International Cartographic Association
- International Chiropractors Association
- International Christian Academy (Ivory Coast)
- International Christian Academy (disambiguation)
- International Clarinet Association
- International Coffee Agreement
- International Commission for Acoustics
- International Communication Association
- International Congress of Actuaries
- International Congress of Americanists
- International Cooperation Administration
- International Cooperative Alliance
- International Council on Archives
- International Court of Arbitration
- International Cycling Association
- Interstate Commerce Act
- Investment Canada Act
- Irish Citizen Army
- Irish Countrywomen's Association
- Irlam and Cadishead Academy
- Islamic Consultative Assembly
- Islamic Cultural Association (Hong Kong)
- Islamitisch College Amsterdam
- Israel Start-Up Nation
- Ivy Collegiate Academy
- Latent autoimmune diabetes
- Mastercard
- Putumayo River
- Zeiss Ikon