| Changchun Institute of Applied Chemistry | Academic & Science |
| A Central Intelligence Agency Computers | Business |
| Citizen Involvement Advisory Committee | Business |
| Capital Improvements Advisory Committee | Business |
| Capital Improvement Advisory Committee | Business |
| Continuous Improvement Advisory Committee | Business |
| Construction Industry Advisory Committee | Business |
| Community Innovation and Action Center | Community |
| Center For Indigenous Arts Cultures | Community |
| Community Involvement Advisory Committee | Community |
| Cornell International Affairs Conference | Community |
| Computer Incident Advisory Center | Computing |
| Computer Incident Assessment Capability | Computing |
| Computer Incident Advisory Capability | Computing |
| Clinicians In Abortion Care | General |
| Cluster de la Industria d'Automocio de Catalunya | General |
| Colorado Information Analysis Center | General |
| Contributions In Aid of Construction | General |
| Cisco Intelligent Automation for Cloud | General |
| Center for Information Assurance and Cybersecurity | General |
| Coalition to Improve Advanced Care | General |
| Contribution In Aid of Construction | General |
| Commercial and Industrial Air Conditioning | General |
| California International Arbitration Council | Governmental |
| Cuerpo de Ingenieros de Armamento y Construcción | Governmental |
| Computer Incident Advisory Capability (U.S. Department of Energy) | Governmental |
| China and Inner Asia Council | Governmental |
| California Intersegmental Articulation Council | Governmental |
| Community Involvement Advisory Council | Governmental |
| Cephalopod International Advisory Council | Governmental |
| Construction Industry Advisory Council | Governmental |
| Carolinas Intercollegiate Athletic Conference | Sports |
| Central Intercollegiate Athletic Conference | Sports |
| Connecticut Interscholastic Athletic Conference | Sports |