Formal or informal associations of human beings, usually in pursuit of some common goal
- Radical Libertarian Alliance - One of the first U.S. libertarian organizations, founded in 1969
- Randolph Bourne Institute, The - Promotes non-interventionist foreign policy in the United States
- Reason Foundation - Promotes libertarian principles, including free markets, individual liberty, and the rule of law
- 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 Instituut - Murray Rothbard Institute in Antwerp, Belgium
- Rush - Canadian rock band