- Radical Libertarian Alliance - One of the first U.S. libertarian organizations, founded in 1969
- Randolph Bourne Institute - Promotes non-interventionist foreign policy in the United States
- Reason Foundation - Promotes libertarian principles, including free markets, individual liberty, and the rule of law
- Reason Magazine - "Free Minds and Free Markets"
- Reason Public Policy Institute - Promotes choice, competition, and a dynamic market economy
- Region 66 of California, Libertarian Party - California
- Republican Liberty Caucus - Pro-liberty individuals affiliated with the Republican Party
- Republican Party - United States
- Rhode Island, Libertarian Party of
- Riverside County, Libertarian Party of - California
- Rothbard Caucus, Libertarian Party - Libertarian Party interest group inspired by Murray Rothbard
- Rothbard Instituut - Murray Rothbard Institute in Antwerp, Belgium
- Rush - Canadian rock band
- Russian Libertarian Movement - Moscow
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