| International Pacific Research Center | Academic & Science |
| International Process Research Consortium | Academic & Science |
| Illinois Prevention Research Center | Academic & Science |
| Institutional Promotion and Resource Center, Itahari, Nepal | Academic & Science |
| International Pharmaceutical Research Center | Academic & Science |
| ISRO Propulsion Complex | Academic & Science |
| Invited Postdoc Research Colloquium | Academic & Science |
| Inequality and Policy Research Center | Academic & Science |
| Interdisciplinary Practice and Research Center | Academic & Science |
| Israel Plastics and Rubber Center | Business |
| Inter-Provincial Roof Consultants, LTD. | Business |
| International Powers of Racism and Classism | Community |
| Independent Publishing Resource Center | Community |
| International Peace Resource Center | Community |
| Indiana Prevention Resource Center | Community |
| Iglesia Presbiteriana Reformada del Caribe | Community |
| Imperial Park Recreation Center | Community |
| Identification Placement Review Committee | Community |
| Individual Placement and Review Committee | Community |
| Internet Protocol Resource Card | Computing |
| Intellectual Property Rights Committee | Computing |
| Infrastructure Plan Review Center | General |
| Identification, Placement, and Review Committee | Governmental |
| Intellectual Property Rights Center | Governmental |
| Injury Prevention Research Center | Medical |
| Identification and Placement Review Committee | Medical |
| Iowa Practitioner Review Committee | Medical |
| International Pediatric Rehabilitation Collaborative | Medical |
| Integrated Polytechnic Regional Center | Regional |