| Queen Mary University London | Academia |
| Rahman Renewable Energy Co. | Private Industry |
| Rakai women's Effort to save the Environment (RAWESE) | Non-Governmental Organization |
| Reach Out Nkokonjeru Parish HIV/AIDS Initiative | Non-Governmental Organization |
| Regional Programme to Promote Household and Alternative Energies in the Sahel (PREDAS) | Multilateral |
| Renewable Energy & Energy Efficiency Institute (REEEI) | Academia |
| Renewable Energy and Energy Efficiency Partnership | Academia |
| Renewgen Systems Inc. | Independent Consultant |
| Research Institute for Development (RIDEV) | Non-Governmental Organization |
| Reseau de Geston de Ressources Naturelles et Decentralisation | Non-Governmental Organization |
| Resource Development Foundation (RDF) | Non-Governmental Organization |
| Resource Efficient Agricultural Production - Canada (REAP - Canada) | Non-Governmental Organization |
| Restio Energy | Independent Consultant |
| Rico Pintor - Private Consultant | Academia |
| Rift Technologies | Independent Consultant |
| Rotary Club of Fresno | Non-Governmental Organization |
| RTI International | Non-Governmental Organization |
| Rural African Renewable Energy Project | Non-Governmental Organization |
| Rural Agency for Sustainable Development (RASD) | Non-Governmental Organization |
| Rural Energy Development Programme | Non-Governmental Organization |
| Rural Mutual Development | Non-Governmental Organization |
| Rural Region and Agro-forestry Development Centre (RRAFDC) | Non-Governmental Organization |
| Safe Environment Conservation Management | Private Industry |
| Safeline Microfinance Bank Limited | Other Organization Type |
| Samaru College of Agricultue | Academia |
| Samuchit Enviro Tech Pvt Ltd | Private Industry |
| San Diego State University | Academia |
| Sanjay Technoplast Pvt. Ltd. | Private Industry |
| SeaChar (AKA The Seattle Biochar Working Group) | Non-Governmental Organization |
| SEED Bangla Foundation | Non-Governmental Organization |
| SENCICO | Government |
| Servals Automation Private Limited | Private Industry |
| SET DEM FREE INTERNATIONAL | Non-Governmental Organization |
| SHARAN | Non-Governmental Organization |
| Shell Foundation | Private Industry |
| Shengzhou Stove Manufacturer | Private Industry |
| Shourav Social Welfare Foundation | Non-Governmental Organization |
| Shri Jagdamba Samiti | Non-Governmental Organization |
| Siddique Sanitation | Other Organization Type |
| Sierra Carbon Solutions | Private Industry |
| Sierra Club | Non-Governmental Organization |
| SilverCeramicSystems.com | Other Organization Type |
| SimGas BV | Private Industry |
| Simplified Technologies For Life | Private Industry |
| SIRL Technologies Limited | Carbon Project Developer |
| SKG SANGHA | Non-Governmental Organization |
| Small World Carbon | Carbon Project Developer |
| smallsolutions | Other Organization Type |
| SMEFUNDS | Non-Governmental Organization |
| SNV Laos | Non-Governmental Organization |
