| HUD Exchange | Community Resilience
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| HUD Office of Native American Programs
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| Hudson River Reserve
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| 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
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| Hydrologic Research Center, San Diego
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| Iced Coffee, Please
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| ICF
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| 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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| Indian River Lagoon National Estuary Program
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| Indiana University | Environmental Resilience Institute
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| Indiana University | School of Public Health
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| Indiana University–Purdue University Indianapolis | Center for Service and Learning
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| Indigenous Sentinel Network
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| Infrastructure for the European Network of Earth System Modelling
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| Innovation Center for U.S. Dairy
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| Institute for Coastal Adaptation and Resilience
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| Institute for Defense Analyses
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| Institute for Social and Environmental Transition-International
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| Institute for Sustainable Communities
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