- Lachmann, Ludwig M. - 20th century German-born economist of the Austrian School
- Lail, Leah - TV and film actress, played Kay Simmons in the TV series "V.I.P."
- Lamb, Brian - Founder and chief executive of the C-SPAN television network
- Lane, Rose Wilder - American journalist, author of The Discovery of Freedom
- Lange, John Frederick, Jr.@ - Professor of philosophy and author (as John Norman)
- Lao Tzu - Ancient Chinese philosopher, author of the Tao Te Ching
- Lark, James W. - Libertarian National Committee Chair 2000-2002, college campus organizer
- Larroquette, John B. - Television actor, winner of Emmy awards for "Night Court"
- Law Enforcement - Sheriffs and police officers
- LeFevre, Robert - Founder of the Freedom School (later known as Rampart College) in Colorado Springs
- Leary, Denis - Stand-up comedian, TV and film actor, producer
- Lee, Richard Henry - Signer of the U.S. Declaration of Independence, sixth president of the Continental Congress
- Lee, Robert E. - Commander of the Confederate forces during the American War Between the States
- Leef, George C. - Director of the Pope Center for Higher Education Policy, former professor at Northwood University
- Leigh, Vivien - Hollywood actress, winner of Oscars for Gone with the Wind and A Streetcar Named Desire
- Lester, Jan Clifford - British professor of philosophy
- Letterman, David - American comedian, host of "The Late Show with David Letterman"
- Lewis, Chris - New Zealander tennis player, coach to Ivan Lendl, 1983 Wimbledon finalist
- Libertarian Candidates - Libertarian Party candidates for President and other offices
- Liggio, Leonard P. - Executive Vice President of the Atlas Economic Research Foundation
- Lilburne, John - 17th century English activist, advocate of "freeborn" rights and of a written constitution
- Linaweaver, Brad - American science fiction writer, winner of the 1989 Prometheus Award
- Lincoln, Abraham - Sixteenth President of the United States
- Locke, John - 17th century English philosopher
- Long, Roderick - Professor of philosophy at Auburn University, president of the Molinari Institute
- Longoria, Sam - Independent filmmaker and visual effects engineer
- Lorenz, Douglas - Former Chairman of the Republican Liberty Caucus, founder of Lorenz Technologies
- Lott, John R. Jr. - Economist, author
- Lucas, George - American screenwriter and director, famous for the Star Wars and Indiana Jones movies
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