- Catalina Radio Control Modelers
 - Foundation for Animals In Risk
- FAIR takes in healthy, adoptable animals and places them in volunteer foster homes until they can find permanent, loving homes.
- Habitat for Humanity Tucson
- Builds homes using volunteer labour for low-income families in the Tucson area.
- International Arid Lands Consortium -IALC
- Independent, nonprofit organization dedicated to fostering sustainable uses of the world's arid and semiarid lands.
- International BioPark Foundation (IBF)
- Dedicated to fostering appreciation and conservation of New World wildlife, plants, indigenous peoples, and their traditional cultures.
- International Dark-Sky Association
- Nonprofit membership-based organization that aims stop the adverse environmental impact of light pollution and space debris.
- International Studies Association@
- Perimeter Bicycling Association of America (PBAA)
- Puts on four perimeter cycling events a year, the largest being El Tour de Tucson.
- Phoenix and Tucson Bonsai
- Hub for the Phoenix and Tuscon societies as well as a comprehensive history of the ancient art.
- Southwest Center for Biological Diversity
- Protecting endangered species and wild places through science, policy, education, and environmental law.
- Tucson Herpetological Society
- Information about meetings & activities, research projects, gallery of photos, membership info., herpetological Links, and monthly newsletter (Sonoran Herpetologist).
- Tucson Sierra Club Inner City Outings
- Working with disadvantaged urban youth taking them hiking, biking, camping, and rafting to promote leadership and environmental education.
- Tucson Volkssport Klub
- Promoting physical fitness and good health by providing safe exercise in a stress-free environment is the hallmark of volkssporting, including walking.
- United Way of Tucson and Southern Arizona
- Volunteer Center of Tucson
- Promotes and recognizes adult and youth volunteerism, community service, donations and charity.
- Wilderness Expeditions Ltd.
- Nonprofit organization assisting the starving Tarahumara indians of the Copper Canyon region in Mexico.
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