| Air Quality Ontario | | Provides smog alerts, air quality forecasts and suggestions to reduce pollution for Ontarians. |
| AMRC - Association of Municipal Recyclers | | Recycling tips, members' public pages, section for members only, executive organization, notices of education, workshops and information sessions news and reports. |
| Burnt Lake | | Information about a pristine lake in the Parry Sound area. Offers peace, quiet and serenity because of power boats, banned by Federal Law. |
| Ecotecture Canada | | A registered charity dedicated to public education to further the goals of environmental, social, economic and cultural sustainability. Includes information about its projects and newsletters. |
| Friends of the Escarpment | | Not-for-profit organization dedicated to advocacy and activism to preserve the ecological diversity of the Niagara Escarpment. |
| FrogWatch Ontario | | Seeks volunteers to listen for frog and toad calls in their local wetlands as part of a project to monitor amphibian populations. |
| Green Ontario | | A guide to the environmental scene in Ontario, including factsheets on environmental issues and directories of organizations. |
| Oak Ridges Moraine Foundation | | The ORMF provides funding to protect the Oak Ridges Moraine, an ecosystem that stretches across Central Ontario. Provides maps of the Moraine and a vision for its future. |
| Ontario Clean Air Alliance | | A coalition of health, environmental and consumer organizations utilities, municipalities and individuals working for cleaner air through strict emission limits and a phase-out of coal in the electricity sector. |
| Ontario Horticultural Association | | Provides information, organization and networks for Ontario gardeners. The OHA publishes a quarterly newsletter and conducts an annual convention, promotes youth participation and the furtherance of horticulture and community interests. |
| Ontario Professional Foresters Association | | Governs the standards of practice of forestry in the province, and lists information about legislation, policies and guidelines, membership, news and a classified advertising section. |
| Ontario Steelheaders | | A non-profit organization of volunteers in partnership with government and other agencies to improve access and habitat for migratory rainbow trout in southern Ontario. |
| Ontario Streams | | Raises public awareness in volunteer stream and watershed projects. |
| Positive Power | | Advocates developing community-based wind power and sustainable/renewable energy in the Halton, Haldimand, and Hamilton areas. Lists press releases and links to related and educational sites. |
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