Resource: Professional Societies
- Pacific Marine Mammal Center
- Pacific Whale Foundation
- PADI Aware Foundation
- Palau International Coral Reef Center
- Parley For The Oceans
- Partnership for Interdisciplinary Studies of Coastal Oceans
- PEN American Center
- Pennsylvania Department of Environmental Protection
- Philadelphia Film Society
- Photographic Society of America
- Phycological Society of America
- Phycological Society of America
- Plan Vivo Foundation
- Plankton, Aerosol, Cloud, ocean Ecosystem, NASA
- Plant Heritage
- Planting Science
- Plastic Oceans
- Plastic Pollution Coalition
- Plastic Soup Foundation
- Poetry Society of America
- Poets & Writers Online
- Point Blue Conservation Science
- Point Blue Conservation Science
- Polar Bears International
- Poynter Institute
- Producers Guild of America
- Professional Association of Diving Instructors
- Professional Photographers of America
- Professional Women Photographers
- Project Drawdown
- Project Her
- Project Seahorse
- Promare
- ProPublica
- Public Safety Writers Association
- Queer Women of Color Media Arts Project
- Rainforest Foundation US
- RAVEN (Respecting Aboriginal Values and Environmental Needs)
- Reef Check Foundation
- Reef Relief
- Reef Relief
- ReefBase
- ReFrame
- Remote Energy
- Restore America's Estuaries
- Rhode Island Department of Environmental Management
- Ric O'Barry's Dolphin Project
- Rise St. James
- Rocky Mountain Fiction Writers
- Rocky Mountain Institute (RMI)