Friends of Saguaro National Park
- Nonprofit organization founded to assist the National Park Service with the funding of special projects in the park.
- http://www.friendsofsaguaro.org/

Northern Jagaur Project
- Supports and helps maintain a wildlife reserve in Sonora, Mexico. Site has project information and news, and photographs of the land and its animals.
- http://www.northernjaguarproject.org/

Sonoran Arthropod Studies Institute
- Conducts education and research programs on the insects, arachnids, and other arthropods found in the Sonoran Desert ecosystem.
- http://www.sasionline.org/

Arizona Research Laboratories
- Supporting and promoting interdisciplinary collaborations which initiate new research and educational programs of high priority to the scientific community. Find details and resources.
- http://www.arl.arizona.edu/

Flandrau Science Center
- Information about astronomy and the planetarium, including a skywatcher's guide, news, hours of operation, and programs.
- http://www.flandrau.org/

Campus Arboretum - University of Arizona
- History, how to get involved, calendar of events, and information about student projects.
- http://arboretum.arizona.edu/

Center for Desert Archaeology
- A non-profit organization which promotes care of the archaeological resources of the Greater Southwest. Includes online exhibits, library, and news archive.
- http://www.centerfordesertarchaeology.org

Tucson Botanical Gardens
- Dedicated to horticultural and ecological education. Includes a history, special events, volunteer and membership information, and covers its special programs.
- http://www.tucsonbotanical.org/

Pima Air and Space Museum
- The facility has a collection of more than 250 aircraft, occupying over 150 acres. Features online exhibits, archives, library, events schedule, and membership information.
- http://www.pimaair.org/