- MIT Libertarians - Massachusetts Institute of Technology
- Mackinac Center for Public Policy - Promotes sound solutions to state and local policy questions in Michigan
- Maine, Libertarian Party of
- Manhattan Libertarian Party - New York
- Manitoba, Libertarian Party of - Canada
- Marijuana Policy Project - American lobbying organization, works to minimize harm associated with marijuana
- Marion County, Libertarian Party of - Florida
- Martin County, Libertarian Party of - Florida
- Maryland, Libertarian Party of
- Massachusetts, Libertarian Party of
- Miami-Dade County, Libertarian Party of - Florida
- Michigan, Libertarian Party of
- Milton and Rose D. Friedman Foundation - Resource for parents and groups who want parental choice in education
- Minnesota, Libertarian Party of
- Mises Institute@ - Ludwig von Mises Institute
- Mississippi, Libertarian Party of
- Missouri Libertarian Party
- Monmouth County Libertarian Party - New Jersey
- Monroe Libertarians - Florida
- Mont Pelerin Society - Aims to strengthen the principles and practice of a free society
- Montana Libertarian Party
- Movimiento Libertario - Libertarian party in Costa Rica
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