Clean Fuels Ohio
- Non-profit organization based at The Ohio State University working to advance cleaner fuels and vehicles in the state. Includes news items, upcoming events, membership details, a newsletter, and technology articles.
- http://www.cleanfuelsohio.org/

Association of Ohio Recyclers
- Promotes recycling and waste prevention while serving our members through information exchange, education, networking, and advocacy.
- http://www.aor-omex.org/

All Ohio Chapter of the Soil and Water Conservation Society
- A nonprofit, scientific and educational organization of professional conservationists. Includes news, events and membership.
- http://www.ohiochapterswcs.org/

Ohio Nature Education
- A non-profit organization providing nature education programs to schools, scout troops, garden clubs, senior centers, metro parks, and community centers.
- http://www.ohionature.org/

Ohio Bird Banding Association
- Provides overview and news.
- http://www.ohiobba.org/

Air and Waste Management Association: Northern Ohio
- The Northern Ohio chapter provides information on local technical seminars, and current events.
- http://www.nocawma.org

SWANA Ohio Buckeye Chapter
- A chapter for the solid waste professionals of Ohio. Includes newsletter, and schedule of events and training.
- http://www.swanaohio.org/

Ohio Cichlid Association
- Organization dedicated to the advancement and dissemination of information relating to the biology of cichlids and related aquatic life. Includes bulletin and schedule of meetings.
- http://www.ohiocichlid.com/

Dysart Defenders
- Statewide organization dedicated to protecting Dysart Woods, among the last of the remaining ancient forest in Ohio. Bulletins, fliers, picture gallery, and information on their events.
- http://www.dysartwoods.org/

Buckeye Forest Council
- An Ohio grassroots environmental organization with two major projects including protecting public forests and organizing citizens affected by coal mining.
- http://www.buckeyeforestcouncil.org/

Ohio Geological Society
- A nonprofit organization dedicated to advance the science of geology as it relates to petroleum, natural gas and associated liquids, and other natural resources.
- http://www.ohiodnr.com/geosurvey/ohgeosoc/ohgeosoc.htm

Ohio Coleopterists
- A nonprofit organization whose purpose is to enhance understanding of and promote interest in the beetles of Ohio. Includes beetle database, newsletter, and member details.
- http://www.ohiocoleo.org/home.asp

Green Energy Ohio (GEO)
- A nonprofit organization dedicated to promoting environmentally and economically sustainable energy policies and practices in Ohio. Offices located in Cleveland and Columbus.
- http://www.greenenergyohio.org/

Astronomy Network of Ohio
- Contains information for everyone interested in astronomy and the wonders of the natural sky. Includes list of clubs in Ohio.
- http://www.wro.org/ano/

Ohio Turnpike Astronomers Association
- Unofficial site presenting newsletter, bulletin board, and contact details.
- http://www.astras-stargate.com/whatis.htm

The Nature Conservancy of Ohio
- Mission is to preserve Ohio plants, animals and natural communities by protecting the lands and waters they need to survive.
- http://nature.org/wherewework/northamerica/states/ohio/

Archaeological Society of Ohio
- Organized to discover and conserve archaeological sites and material within the state of Ohio.
- http://www.ohioarch.org/

Ohio Lepidopterists
- Promotes interest in the butterflies, skippers and moths of Ohio and neighboring states.
- http://www.ohiolepidopterists.org/

Ohio Wetlands Foundation
- Non-profit providing wetland, off-site compensatory mitigation credits and funding wetlands research and education.
- http://www.ohiowetlands.org/

Sierra Club, Ohio Chapter
- State chapter of the environmental protection advocacy organization.
- http://ohio.sierraclub.org/

Rivers Unlimited
- mission is to restore, protect and improve Ohio's rivers and streams, their water quality, and scenic beauty.
- http://www.riversunlimited.org/

Ohio Environmental Council
- Non-profit advocacy group committed to solving ecological problems. Site includes tips, calendar, and membership information.
- http://www.theoec.org/

GreenLink
- Environmental advocacy for Ohio focused on clean water, toxic chemical reductions and urban sprawl. Site provides archives, resources, and links.
- http://www.greenlink.org/