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Astronomers Without Borders
The goal of this organization is to foster international understanding through the universal fascination with astronomy. Includes information on their various philanthropic ventures, plus details of how to get involved or donate.
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The Astronomy White Pages
Directory of websites of astronomy organizations in the United States, Canada, United Kingdom, New Zealand, Australia, and Europe.
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Board on Physics and Astronomy
Serves as a forum for issues involving the fields of physics and astronomy.
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Euclid
An ESA mission to map the geometry of the dark Universe.
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The Planetary Society
Provides society and membership information, a list of publications, links, and an online store.
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Planetary Studies Foundation
Illinois-based nonprofit organization created to foster scientific literacy and to promote interest in the sciences.
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United Nations Office for Outer Space Affairs
Comprehensive resources, policy documents, news, activities of member states and details of reports available.