- Adopt A Tree Today
 - A concept allowing individuals and companies to adopt fruit bearing trees and reduce their carbon footprint. - American Forests
- Citizens working for healthy and sustainable community and rural forest ecosystems since 1875, home of the Global ReLeaf environmental campaign.
- American Lands
- For forest activists working to stop logging of pristine wildlands and to protect biodiversity on the National Forests and public lands.
- American Tree Farm System
- Promoting the growth of renewable forest resources on private lands while protecting environmental benefits and increasing public understanding of forestry.
- Ancient Cross Timbers Project
- The Cross Timbers form an ecotonal mosaic between the deciduous forests of the eastern U.S. and the tall grass prairies of the southern Great Plains.
- ARuPA (Vounteers Alliance for Saving the Nature)
- Seeks a sustainable, fair, and democratic management of natural resources in Indonesia.
- Association for Forest Development and Conservation
- Aims to protect forests from fire, encourage volunteer work, and promote sustainable development and environmental awareness.
- Cascadia Forest Alliance
- Works to protect native natural forests in the Portland, Oregon area and the Eagle Creek watershed.
- Cedars for the Au Sable
- Northern white-cedar planting and protection project on Michigan's Au Sable River.
- Colorado Wild
- Works to halt environmentally damaging ski area expansions, logging, and motorized recreation to protect wildlife in the forests of Colorado.
- DuMond Conservancy for Primates and Tropical Forests
- Working to enhance the welfare of primate populations and tropical forest ecosystems.
- Dysart Defenders
- Working to save the last .004 percent of the remaining ancient forests left in Ohio from the impact of pending mining activities.
- Eastern Old-Growth Clearinghouse
- Working to further the preservation and restoration of old-growth forests in eastern North America.
- Environmental Protection Information Center
- Working to protect biodiversity and ancient forests on the North Coast of California.
- Forest Conservation Council
- Works to protect and restore the native biological diversity of forests and woodlands throughout the United States.
- Forest Ethics
- Dedicated to protecting the ancient rainforests of British Columbia and endangered forests of North America by redirecting U.S. markets toward ecologically sound alternatives.
- Forests Forever
- Working to protect and enhance the forests and wildlife habitat of California through educational, legislative, and electoral activities.
- Friends of Allegheny Wilderness
- Seeks to work with Pennsylvania's citizens and the U.S. Forest Service to designate new federal wilderness in the Allegheny National Forest.
 Future Forests
- Plants trees to offset the effects of carbon dioxide emissions on the environment. Glenbower Wood and Lake
- Voluntary group aiming to preserve natural beauty of the Glenbower Wood near Killeagh, Co. Cork.- Global Forest Watch
- Provides information on logging, mining, and other development activities within and around frontier forests as, or before, it happens.
- Global Trees Campaign
- Working to preserve threatened tree species and habitats through information, conservation and wise use. Campaign focuses on trees as flagship species for conservation of ecosystems and landscapes.
- Goongerah Environment Centre
- Independent organisation dedicated to protecting the remaining old growth forests of the region.
- Green Light Trust
- Promotes environmental education through positive action: running workshops for U.K. schools, planting woodland in local communities, and saving rainforest communities in Papua New Guinea.
- Greenfleet
- Specialises in reducing the environmental impacts of transportation by planting native trees to offset current CO2 emissions.
- Instituto Terra
- Nonprofit helping to conserve and restore Brazil's threatened Atlantic Forest through education, research, and reforestation.
- Irish Woodworkers for Africa (IWFA)
- Supports sustainable development and the wise use of natural resources, especially wood.
- Kipepeo Butterfly Project
- Butterfly farm based at Gede Ruins National Monument conserving nature on Kenya's coast.
- Merck Forest & Farmland Center
- Environmental education organisation offering hiking, camping, summer camp programmes, and a newsletter.
- National Forest
- Project recreating woodlands in the English Midlands and encouraging alternative land use by farmers and landowners.
- National Forest Protection Alliance (NFPA)
- Dedicated to ending commercial logging on National Forests and all federal public lands.
- Native Forest Council
- Grassroots organisation working to preserve America's publicly owned land from resource extraction.
- Native Forest Network (NFN) (2)
- Native Woodland Trust
- Dedicated to the preservation and expansion of Ireland's anceint woodland heritage.
- New Forests Project
- People-to-people, nonprofit environmental organisation established in an effort to curb deforestation in developing countries. In English, French, and Spanish.
- Northern Forest Alliance
- Coalition of conservation, recreation, and forestry organisations united in their commitment to protect the Northern Forest of Maine, New Hampshire, Vermont, and New York.
- Northwoods Wilderness Recovery
- Working to preserve and restore native forests of the North Woods, and address root causes of forest decline.
- NRDC: Parks, Forests, & Wildlands
- Explores the causes and consequences of forest destruction from Alaska's Tongass rainforest, to British Columbia's forests.
- Operation Green Leaves
- Dedicated to the environmental education of the global Haitian community and reforestation of the island nation of Haiti.
- Plant-a-Tree
- Sponsors pay for tree planting in response to user mouse clicks.
- Project Crimson
- National conservation programme sponsored by Carter Holt Harvey seeking to rescue the native New Zealand pohutukawa and rata flowering tree species.
- Reforesting Scotland
- Campaigns for reforestation and provides resources and help for communities who wish to plant/manage their own community woodland.
- ReThink Paper
- Works to educate the government, industry, and the general public about ecological paper issues.
- San Gorgonio Wilderness Association
- Nonprofit volunteer organisation dedicated to preserving and protecting Southern California's San Gorgonio wilderness.
- Save America's Forests
- Has sponsored national legislation to change the U.S. Forest Service charter from timber extraction to forest stewardship.
- Save The Forests
- Dedicated to saving Western Australia's old growth forests from logging and clear felling.
- Save the Redwoods League
- Sempervirens Fund
- A private, nonprofit land conservancy dedicated to protecting coast redwood land and making that land available for public enjoyment.
- Taiga Rescue Network@
- Trees for the Future
- Initiates and supports environmentally beneficial self-help projects.
- Umpqua Watersheds, Inc
- Opposing clearcutting, logging of old growth forest, excessive road building, and other forms of industrial logging in the Umpqua Basin.
- Woodland Trust
- Dedicated to the protection of our native woodland heritage.
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