Resource: Professional Societies
- Rocky Mountain Women’s Film Institute
- Romance Writers of America
- Royal Photographic Society
- Rural Coalition/Coalición Rural
- Sailors for the Sea
- Salinity, NASA
- San Diego Coastkeeper
- San Diego Science Writers Association
- San Diego Underwater Photographic Society
- Sanibel-Captiva Conservation Foundation
- Sarasota Dolphin Research Program
- Save Ontario Shipwrecks
- Save Our Seas Foundation
- Save the Manatee
- Science Communicators in North Carolina
- Science Fiction and Fantasy Writers of America
- Science Media Centre
- Science Moab
- Science Writers & Communicators of Canada
- Science Writers in New York
- Scientific Boating Safety Association
- Scientific Illustration Consortium
- Scientista
- Scripts Institute of Oceanography
- Scuba Diving International
- Scuba Schools International
- Sea Change
- Sea Life Trust
- Sea Shepherd Conservation Society
- Sea Turtle Conservancy
- Sea Watch
- Seacology
- Seal Rescue Ireland
- SeaLegacy
- SeaSave
- SeaTrees by Sustainable Surf
- Seaturtle.org
- Secore International
- Seed&Spark
- SETI Institute
- SFFILM Documentary Film Fund
- Shark Foundation
- Shark Research Institute
- Shark Stewards
- Shark Trust
- Ships of Discovery
- Shipwrecks: Artifacts & Treasure
- Shooting People
- SIDCO: Non-Profit Marine Archeology & Exploration
- Sierra Club