| IBS Center for Climate Physics | Academic & Science |
| International Commission on Clouds and Precipitation | Academic & Science |
| International Conifer Conservation Programme | Academic & Science |
| International Climate Change Partnership | Academic & Science |
| International Conformity Certification Program | Business |
| Impressed Current Cathodic Protection | Chemistry |
| Islamic Community Center of Potomac | Community |
| Islamic Community Center Potomac | Community |
| Islamic Community Center of Phoenix | Community |
| International Camp Counselor Program | Community |
| Institute for Certification of Computing Professionals | Community |
| International Council for Childrens Play | Community |
| Integrated Child Care Programme | Community |
| International Christian Community of Provence | Community |
| Institute for Certification of Computer Professionals | Computing |
| Information Computer and Communications Policy | Computing |
| International Consortium of Computing Professionals | Computing |
| Intelligent Computer Communication and Processing | Computing |
| Inter Control Center Protocol | General |
| International Congress Of Cognitive Psychotherapy | General |
| Inter Chassis Communication Protocol | General |
| International Conference on Computational Photography | General |
| Inner City Children's Program | General |
| Institute of Construction Claims Practitioners | General |
| Idaho Child Care Program | Governmental |
| International Conference on Concrete Pavements | International |
| International Conference on Cataloging Principles | International |
| International Cancer Control Partnership | Medical |
| International Council of Coloproctology | Medical |
| Inter-control Center Communications Protocol | Networking |
| Interface Coordination and Control Procedure | Space Science |