SpaceRef - Organizations - Astronomy and Astrophysics

International Dark-Sky Association - The IDA is a non-profit, membership-based organization. IDA's goal is to be effective -- through education about (a) the value and effectiveness of quality nighttime lighting and (b) of the solutions to the problems -- in stopping the adverse environmental impact of light pollution and space debris.

International Meteor Organization (IMO) - The IMO was created in response to an ever growing need for international cooperation of meteor amateur work. The collection of meteor observations by several methods from all around the world ensures the comprehensive study of meteor showers and their relation to comets and interplanetary dust.

Marswatch - The International MarsWatch is a group founded by amateur and professional astronomers more than 30 years ago to facilitate better communication between the amateur and professional Mars observing communities.

The Living Universe Foundation - This organization was once known as "The First Millennial Foundation", an organization that is dedicated to the human colonization of the universe.

The UK Planetary Forum - This organization is an informal network of researchers and others connected with planetary science in the UK.