Hawaii Association of Environmental Professionals
- A non-advocacy multi-disciplinary professional organization whose purpose is to promote improvement in environmental knowledge and environmental management in the State of Hawaii.
- http://www.haep.org/

Dolphin Institute
- Conducts education, research, and conservation of bottlenose dolphins and humpback whales. In Honolulu.
- http://www.dolphin-institute.org/

Hawaii's Thousand Friends
- Timeline describing the organization's past efforts, links regarding environmental issues and information related to Hawaii's public trust doctrine.
- http://www.hawaiis1000friends.org/

Sierra Club, Hawaii Chapter
- Organization working to restore air and water quality, to protect and restore the land and preserve biological diversity and to conserve our region's resources.
- http://www.hi.sierraclub.org/index.html

Outdoor Circle
- Information about the organization's efforts to keep Hawaii green and clean.
- http://www.outdoorcircle.org/

Malama Hawaii
- Information about the organization and calendar of service projects.
- http://www.malamahawaii.org/

Hawaiian Botanical Society
- Advance the science of Botany in all its applications, encourage research in Botany in all its phases, and promote the welfare of its members, developing the spirit of good fellowship and cooperation among them.
- http://www.botany.hawaii.edu/botsoc/botsoc.htm

Hawaii Water Environment Association
- Professional organization dedicated to preserving and enhancing the water environment in the Pacific Island Region.
- http://www.hwea.org/

Hawaii Chapter, The Nature Conservancy
- About the organization, its preserves, endangered species in the islands, and conservation research activities.
- http://nature.org/wherewework/northamerica/states/hawaii/

Friends of Mokuula
- General information, news articles, reports and photos about Moku'ula and Mokuhina, Lahaina, Maui.
- http://www.mokuula.com/

EnviroWatch
- Environmental issues and advocacy news.
- http://www.envirowatch.org/

Earthjustice: Honolulu Hawaii Regional Office
- About this organization's present and past efforts to protect natural and cultural resources throughout Hawai'i.
- http://www.earthjustice.org/regional/honolulu/

'Ahahui Malama I Ka Lokahi - Native Hawaiians for the Preservation of Hawaiian Ecosystems
- About this nonprofit organization's efforts to protect native ecosystems. Information about the group and its activities, species of interest, and the relationship of native material culture to ecosystems.
- http://www.botany.hawaii.edu/GradStud/pang/index.htm