| Interdepartmental Committee for Atmospheric Sciences | Academic & Science |
| Interuniversity Consortium for Arab Studies | Academic & Science |
| Intersegmental Committee of the Academic Senates | Academic & Science |
| International Congress of Anthropological Sciences | Academic & Science |
| Ilahia College of Arts and Science | Academic & Science |
| Island County Astronomical Society | Academic & Science |
| Institute of Chartered Accountants of Scotland | Accounts and Finance |
| International Credential Assessment Service of Canada | Business |
| Independent Counselling and Advisory Services | Business |
| Independent Complaints Advocacy Service | Community |
| Indian Civil Accounts Service | Community |
| International Competitions and Assessments for Schools | Community |
| Inupiat Community of the Arctic Slope | Community |
| International Competitions and Assessment for Schools | Community |
| Immaculate Conception Apostolic School | Community |
| Integrated Cyber Analysis System | Computing |
| Iternity Compliant Archive Software | Computing |
| Intel Communicating Applications Specifications | Computing |
| Identifies the Common Audio Stream | Computing |
| International Center For Advanced Studies | General |
| International Credential Assessment Service | General |
| Independent Complaints Advocacy Services | General |
| Informationintegrated Chronological Applications System | General |
| International Convention Of Asia Scholars | General |
| Integrated Circuits And Systems | General |
| Icasindependent Complaints Advocacy Service | General |
| Internal Credit Assessment System | General |
| Institute for Critical Animal Studies | General |
| Integrated Camden Alcohol Service | General |
| Industrial Computerization and Automation System | General |
| Imaging Collaterals in Acute Stroke | General |
| Integrated Condition Assessment System | General |
| Individual Capital Adequacy Standards | General |
| Intelligent Complex Adaptive System | General |
| Integrated Charge Air Subcooling System | General |
| Isuzu Clean Air System | General |
| Intersection Collision Avoidance System | General |
| Industrie Carrozzerie Auto Sportive | General |
| In Car Application Server | General |
| International Council Of Air Shows | Governmental |
| Institute For Community Arts Studies | Governmental |
| Institute For Central American Studies | Governmental |
| Institute for China America Studies | Governmental |
| Institute for Corean American Studies | Governmental |
| International council of aeronautical sciences | Governmental |
| International Comparative And Asian Societies | International |
| Institutul de Cercetari si Amenajari Silvice | International |
| International Cooperation on Airport Surveillance | International |
| International Centre for Applied Sciences | International |
| International Competition Assessments for Schools | International |
| International Campus for Advanced Studies | International |
| International Council of the Aeronautical Sciences | International |
| Interactive Collection Analysis System | Military and Defence |
