| South Alabama Regional Planning Commission
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| South Atlantic LCC
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| South Carolina Aquarium
|
| South Carolina Department of Natural Resources
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| South Carolina Sea Grant
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| South Central Climate Adaptation Science Center
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| South Dakota State Climate Office
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| South Dakota State University
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| South Dakota State University Extension
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| South Florida Water Management District
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| South Slough Reserve
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| South-Central Partnership for Energy Efficiency as a Resource
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| Southeast Alaska Regional Dive Fisheries Association
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| Southeast Climate Adaptation Science Center
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| Southeast Climate Consortium
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| Southeast Conservation Adaptation Strategy
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| Southeast DEWS
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| Southeast Energy Efficiency Alliance
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| Southeast Florida Regional Climate Compact
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| Southeast Louisiana Veterans Health Care System
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| Southeast Regional Climate Center
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| Southeast Regional Partnership for Planning and Sustainability
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| Southeast River Forecast Center
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| Southeastern Universities Research Association
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| Southern California Coastal Ocean Observing System
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