- 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. - 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.
- Royal Astronomical Society
- Publishes journals, awards medals, fellowships and prizes. Houses one of the most comprehensive libraries and archives in the world.
- 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.
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