Resource: Professional Societies
- Sierra Club - Environmental Law Program
- Simons Foundation
- Sisters in Crime
- SoCal Science Writing
- Société Française d’Exobiologie
- Society for Advancing Business Editing and Writing
- Society for Applied Microbiology
- Society for Conservation Biology
- Society for Ecological Restoration
- Society for Imaging Sciences and Technology
- Society for Industrial Microbiology and Biotechnology
- Society for Industrial Microbiology and Biotechnology
- Society for News Design
- Society for Photographic Education
- Society for Technical Communication
- Society for the Advancement of Chicanos and Native Americans in Science
- Society of Animal Artists
- Society of Children's Book Writers and Illustrators
- Society of Environmental Journalists
- Society of Hispanic Professional Engineers
- Society of Marine Port Engineers
- Society of Mexican American Engineers and Scientists
- Society of Naval Architects and Marine Engineers (SNAME)
- Society of Professional Journalists
- Society of STEM Women of Color
- Soil and Water Conservation Society
- South Carolina Department of Health and Environmental Control
- South Dakota Department of Environment and Natural Resources
- South Florida Underwater Photographic Society
- Southeastern Massachusetts Aquaculture Center
- Southern Appalachian Botanical Society
- Southern Environmental Law Center
- Southern Southeast Regional Aquaculture Association
- Stanford Center for Ocean Resources
- STEM-Trek
- Stempra
- Student Conservation Association
- Sunrise Movement
- Surfers Against Sewage
- Surfrider Foundation
- Sustainability Management Association
- Sustainable Ocean Alliance
- Sustainable Tourism
- Sustainable Tourism Association of Hawaiʻi
- Tallahassee Writers Association
- TechLatino
- Technical Diving International
- Ten 4 Ocean
- Tennessee Department of Environment & Conservation
- Texas Aquaculture Association