- American Association of Variable Star Observers (AAVSO)
 - Both amateur and professional. - Association of Universities for Research in Astronomy (AURA)
- Serves the entire astronomical community by providing modern, major facilities to qualified scientists from many institutions.
- Astronomical Society of the Pacific
- International nonprofit organisation offering educational programmes and products, research publications, and membership benefits.
 Campaign for Dark Skies (CfDS)
- Find out more about the CfDS, what is being done in the U.K., and what you can do to help save our precious skies from light pollution.- Czech Astronomy Society
- Events, links, articles from leading Czech and foreign magazines.
- Gay, Lesbian and Bisexual Members of the Astronomical Community (GLBASTRO)
- Forum for support and networking between lesbian, bisexual, gay, transsexual, etc. members of the astronomical community.
- International Astronomical Union (IAU)
- Promotes and safeguards the science of astronomy in all its aspects through international cooperation. The sole internationally recognised authority for assigning designations to celestial bodies and surface features on such bodies.
- International Dark-Sky Association
- Nonprofit membership-based organisation that aims stop the adverse environmental impact of light pollution and space debris.
- Leicester University Astronomy Society
- Guides to the night sky: galaxies, clusters, nebulae, stars and planets. Tour the observatories, telescopes, events, the month-by-month calendar and ask an astronomer.
- Mars Society UK
- Working to further the goal of the exploration and settlement of the Red Planet.
- National Academy of Sciences Board on Physics and Astronomy
- Planetary Studies Foundation
- Nonprofit sponsoring educational astronomy programmes in Palatine, IL. Links to astronomy articles and tutorials online.
- Royal Astronomical Society
- Publishes journals, awards medals, fellowships and prizes. Houses one of the most comprehensive libraries and archives in the world.
- S.P.A.C.E: Science Popularisation Association of Communicators and Educators
- Involved in the promotion of astronomy and scientific temper in educational institutions.
- Sheffield Astronomical Society
- Features meetings and further information.
- Society for the History of Astronomy
- Encourages amateur research especially at the local level, and organises activities. Offers library, publications, projects, news, meetings, and more.
- South Somerset Astronomical Society
- Provides details on meetings, astronomy articles, screen savers, and humour.
- Texas Astronomical Society of Dallas
- Chartered in 1955 to promote the study of astronomy and related fields and to pursue observation and construction of instruments as a hobby.
- UT Austin - Astronomy Students' Association
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