- California, Libertarian Party of
- Canada, Libertarian Party of
- Cascade Policy Institute - Non-profit research and educational organization that focuses on Oregon
- Cato Institute - Non-profit public policy research foundation in Washington, DC
- Center for Cognitive Liberty and Ethics - Fosters intellectual freedom and cognitive liberty
- Center for Independent Thought - Non-profit educational foundation based in New York City
- Center for Small Government - Seeks to dismantle, reduce, and remove Big Government policies and programs
- Center for Trade Policy Studies - Cato Institute Trade Center
- Center for a Stateless Society - Dedicated to building public awareness of, and support for, market anarchism
- Centre for the Development of Ideas for Greece in the 21st Century - E21
- Centro de Divulgación del Conocimiento Económico - CEDICE, Venezuela
- Centro de Estudios de la Realidad Económica y Social - CERES, Uruguay
- Charleston County Libertarian Party - South Carolina
- Charlotte County, Libertarian Party of - Florida
- Chicago, Libertarian Party of - Illinois
- Circle Bastiat - Informal group of friends of Murray Rothbard in the early 1950s, named after the nineteenth century French economist
- Citizens for a Sound Economy - Grassroots citizens dedicated to free markets and limited government
- Clay County, Libertarian Party of - Florida
- Club for Growth - Helps elect candidates who support limited government and lower taxes
- College Libertarians of UNR - University of Nevada, Reno
- Colleges and Universities
- Collier County, Libertarian Party of - Florida
- Colorado, Libertarian Party of
- Colusa County, Libertarian Party of - California
- Committee for Small Government - Sponsored the Small Government Act in Massachusetts
- Competitive Enterprise Institute - Dedicated to the principles of free enterprise and limited government
- Connecticut, Libertarian Party of
- Convention, 2004 Libertarian National - May 27-31, 2004 - Atlanta, GA
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