| HUD—U.S. Department of Housing and Urban Development
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| Humboldt Area Foundation
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| Humboldt State University | Schatz Energy Research Center
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| Hummingbird Monitoring Network
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| Hydaburg Cooperative Association
|
| Hydrologic Research Center, San Diego
|
| Iced Coffee, Please
|
| ICLEI Local Governments for Sustainability
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| Illinois State Water Survey | Coordinated Hazard Assessment and Mapping Program
|
| Illinois-Indiana Sea Grant
|
| Indiana University | Environmental Resilience Institute
|
| Indiana University | School of Public Health
|
| Indiana University–Purdue University Indianapolis | Center for Service and Learning
|
| Infrastructure for the European Network of Earth System Modelling
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| Innovation Center for U.S. Dairy
|
| Institute for Defense Analyses
|
| Institute for Social and Environmental Transition-International
|
| Instituto Nacional de Ecología y Cambio Climático
|
| 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
|
| Intergovernmental Panel on Climate change (IPCC)
|
| Intermountain West DEWS
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| International Centre for Integrated Mountain Development
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