| Instituto Europeo Campus Stellae | Academic & Science |
| Institute of Estuarine and Coastal Studies | Academic & Science |
| Institute of Engineering and Computing sciences | Academic & Science |
| Inventory of Existing Chemical Substances | Academic & Science |
| Industrial Ecosystems, Inc. | Business |
| Integrated E Community System | Community |
| Intentionally Evangelistic Church Strategy | Community |
| Islamic Educational Center of Seattle | Community |
| Institute for Education Community and Society | Community |
| Innovation in an Era of Challenging Sites | General |
| Integrated Environment for Communication on Ship | General |
| Intelligent Energy Control System | General |
| Intelligent Electronic Control Suspension | General |
| Integrated Emergency Command Structure | General |
| Instituto de Efectividad Clinica y Sanitaria | General |
| Integrated Electromagnetics Circuits and Systems | General |
| Inland Empire Commuter Services | General |
| Intelligent Enterprise Control System | General |
| Igloo Environment Control Subsystem | Governmental |
| Institute of Environmental Change and Society | Governmental |
| Integrated Environmental Control System | Governmental |
| International Economic Conference of Sibiu | International |
| International Education Consultancy Services | International |
| International English and Cultural Studies | International |
| International Education Consultants and Supplies | International |
| International Erosion Control Systems | International |
| International Export Certification Services | International |
| Irish Ethical Celebrants Society | Regional |
