- Advocates for Self-Government
 - Nonprofit educational organisation dedicated to helping individuals encounter, evaluate, and embrace the ideas of liberty. - Association of Libertarian Feminists
- Cato Institute
- Cato Institute is a nonprofit public policy institute. Site contains prepared statements made by senior Cato policy staff members before Congress, conference and lecture information, a gateway to an extensive WAIS database of policy analysis reports, an online book catalogue, and more.
- Center for Libertarian Studies (1)
- Federalist Society (4)
- Foundation For Economic Education
- Publishers of Ideas on Liberty, with articles on liberty freedom and free market economics. Founded by Leonard E. Read.
- Future of Freedom Foundation, The
- Henry Hazlitt Foundation (2)
- Independence Institute
- Non-partisan, nonprofit public policy research organisation dedicated to providing timely information to concerned citizens, government officials, and public opinion leaders.
- International Society for Individual Liberty (ISIL)
- Network of individuals and associations in over 80 countries dedicated to building a free and peaceful world through the ideals of free markets, social tolerance, and individual responsibility.
- Libertarian Party@
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