| Indian River Community College | Academic & Science |
| Industrial Research and Consultancy Centre | Academic & Science |
| Industry Research Coordinating Committee | Academic & Science |
| Industrial Research Consultancy Centre | Academic & Science |
| Instructional and Research Computing Center | Academic & Science |
| India Rubber Comb Company | Business |
| International Relations Career Challenge | Business |
| Independent Roofing Contractors of California | Business |
| International Roof Coatings Conference | Community |
| Indiana Radio Club Council | Community |
| Indian River Colony Club | Community |
| Iron Range Christian Center | Community |
| I Really Couldn't Care | Computing |
| Instructional and Research Computing Council | Computing |
| Infra Red Communications Controller | Computing |
| International Roof | General |
| Internally Routed Cruise Control | General |
| Intelligent Remote Centre Compliance | General |
| Imerys Rio Capim Caulim | General |
| Indian River Corvette Club | General |
| Immigration, Refugees and Citizenship Canada | Governmental |
| Immigration, Réfugiés et Citoyenneté Canada | Governmental |
| Immigration, Refugees and Citizenship Canada/Immigration, Réfugiés et Citoyenneté Canada | Governmental |
| Iraqi Revolutionary Command Council | Governmental |
| Information Resources Coordinating Council | Governmental |
| Immigration Refugee and Citizenship Canada | Governmental |
| International Radical Cystectomy Consortium | International |
| International Recovery and Citizenship Collective | International |
| Italian Renaissance Costuming Challenge | International |
| International Red Cross Conference | International |
| Inverness Railway and Coal Company | Regional |
| Inter Regional Coordination Committee | Regional |
| Inter Regional Coordinating Committee | Regional |
