- Apollo Society
 - A nonprofit educational and research organization dedicated to advancing space exploration and establishing human communities beyond Earth. - Astrianism
- Believes that life is abundant in the universe and that intelligent races are many and that the only future for mankind is to expand into the outer space.
- Distant Star
- Electronic magazine of the First Millennial Foundation, dedicated to human colonization of the galaxy.
- First Millennial Foundation
- A group of people actively working to make the colonization of space a reality.
- ISECCo - International Space Exploration and Colonization Co
- A nonprofit organization dedicated to research and development of the space oriented technologies needed to colonize space.
- Island One Society
- Lunar Republic
- Currently forming colonization of the Moon and offering citizenship and properites for sale. Also includes lunar citizenship, dictionary, and more.
- National Space Society (12)
- Northwestern University - Space Studies Institute
- P.E.R.M.A.N.E.N.T.
- Projects to Employ Resources of the Moon and Asteroids Near Earth in the Near Term. Space industrialization and colonization.
- Space Colonization
- Resources with a transhumanist outlook.
- Space Frontier Foundation
- Organization of Americans dedicated to opening the high frontier of space to human exploration and settlement as soon as possible.
- Space Settlement
- Details the plans for building space habitats and solar power satellites from extraterrestrial resources as presented in Gerard O'Neill's "The High Frontier".
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