Links to go Wikipedia articles, at least to start. For more, please see this Wikipedia article.
- National Space Society
- SETI Institute
- British interplanetary society www.bis-space.com
- Planetary_Society
- Mars Society
- Moon Society
- SEDS students for exploration and development of space
- Spaceup
- World Space Center
- Lunar Explorers Society
- ProSpace
- Space Frontier Foundation
- Earth and Space Foundation
- The Space foundation
- National Aerospace Development Centre
- The Apollo Society
- The American Lunar Society