British Interplanetary Society (BIS) -

The British Interplanetary Society was established in 1933, and is the most prestigous of the UK Space Organisations. The BIS holds regular Space lectures and presentations at its headquarters in Central London, and publishes the widely read Spaceflight magazine, and Journal of the British Interplanetary Society (JBIS) - a space technical journal. Members include Sir Arthur Clarke and Sir Patrick Moore. The BIS also leads the British human space flight campaign.

The Mars Society UK -

The Mars Society UK was established in 1998, and is the advocacy group in the UK for exploration of the planet Mars. The Mars Society UK is an active group, promoting outreach on Mars exploration, running conferences, and leading the Euro-Mars initiative.

UK Students for the Exploration and Development of Space (UKSEDS) -

UKSEDS was established in 1988, and has grown over the years to provide a very valuable resource for students interested in space, as well as space enthusiasts generally. UKSEDS runs an annual space conference in November each year, and produces the Aurora space magazine.
UKSEDS on Facebook

The Space Education Council (SEC) -

The Space Education Council is the operational arm of the Space Education Council. The Space Education Council was established in 1987 to promote space education to young people and the general public.

Association in Scotland To Research into Astronautics (ASTRA) -

See Also

UK Rocketry Vendors, UK Rocket Groups, UK Rocketeers, UK Rocket Educators, UK Space Organisations, UK Space Conferences/Events, UK Astronomical Organisations