International Coffee Agreement - a United Nations pact establishing the International Coffee Organization, initially ratified in 1963.

Interstate Commerce Act - United States legislation establishing the regulatory Interstate Commerce Commission

International Collectors Associates - a precious metals dealer

ICA AG - German camera manufacturer that merged into Zeiss Ikon in 1926.

Internal carotid artery

Irish Citizens Army - an organisation which lasted up to 1916 to rid Ireland of British rule and protect workers.

The Ica Region of Perú

Independent component analysis (signal processing and statistical data analysis)

Institute of Contemporary Arts, London

Intermuseum Conservation Association

Ica language, a Magdalenic Chibchan language related to Ijca spoken in Colombia, South America.

Ica, a city in Perú

Institute of Contemporary Art, Philadelphia

Institute of Contemporary Art, Boston

Independent Computing Architecture, a proprietary protocol for an application server system, designed by Citrix Systems

International Congress of Actuaries

Irish Cycling Association

International Communication Association

International Christian Academy, Côte d'Ivoire - an American boarding school in Bouaké, Côte d'Ivoire.

The Ica Province of Perú

Intercontinental A, a kart racing class for top drivers aged 15 and up

Institute of Cultural Affairs - international non-profit organisation

International Clarinet Association

International Cartographic Association

ICA AB - a Swedish corporate group in the retail business.

Innovative communications alliancs - Alliance formed by Microsoft and Nortel for Unified communications

The Içá River also known as Putumayo River

International Co-operative Alliance - the worldwide umbrella body for co-operatives.

International Contract Agency (fictional) - the organisation responsible for arranging hits for 47 in the Hitman series of games

Indene Carboxylic Acid - Organic acids containing one carboxylic acid group and at least one indene dimer. Such acids are often products of photochemical reactions in photoresist.

ICa (card), smart card ticketing system for public transport in Kanazawa, Japan