| ICLEI Local Governments for Sustainability
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| Illinois State Water Survey | Coordinated Hazard Assessment and Mapping Program
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| Illinois-Indiana Sea Grant
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| Indiana University | Environmental Resilience Institute
|
| Indiana University | School of Public Health
|
| Indiana University–Purdue University Indianapolis | Center for Service and Learning
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| Infrastructure for the European Network of Earth System Modelling
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| Innovation Center for U.S. Dairy
|
| Institute for Defense Analyses
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| Institute for Social and Environmental Transition-International
|
| Instituto Nacional de Ecología y Cambio Climático
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| Integrated Ocean Observing System | Federal Partners
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| Integrated Ocean Observing System | Regional Associations
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| Integrated Water Resources Science and Services
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| Interagency Task Force on Sea Level Change
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| Intergovernmental Panel on Climate change (IPCC)
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| Intermountain West DEWS
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| International Centre for Integrated Mountain Development
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| International City/County Management Association
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| International Federation of Red Cross and Red Crescent Societies
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| International Organization for Migration
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| Internal Revenue Service
|
| International Trade Administration
|
| U.S. International Trade Commission
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| International Union for Conservation of Nature
|
