American Compost Society
- Promotes composting in the community through demonstration and education programs to promote good gardening practices and improve the environment.
- http://www.writethisforme.com/ACS

Green Umbrella
- An alliance of organizations in the Ohio, Kentucky and Indiana tri-state region working to preserve the region's greenspace.
- http://www.greenumbrella.org

Greater Cincinnati Daylily-Hosta Society
- Includes event calendar and membership application.
- http://www.gcdhs.org/

Greater Cincinnati Earth Coalition Website
- A community of non-for-profit organizations, businesses, government agencies and individuals from the tri-state region who work cooperatively and actively to promote the beauty and environmental quality of the tri-state area.
- http://www.earthcoalition.net/

Miami Group, Sierra Club
- Dedicated to protecting the environment. Includes newsletter, election information, events and links.
- http://ohio.sierraclub.org/miami/index.html

Cincinnati Nature Center
- Provides the opportunity to experience, study and enjoy the natural world. Locations in Milford, Goshen, and Evendale.
- http://www.cincynature.org/

Millcreek Watershed Council
- A publicly funded, non-profit corporation representing all 37 political jurisdictions in the Mill Creek watershed. Includes newsletter, event calendar, and overview of committees.
- http://www.millcreekwatershed.org