- MacBride, Roger - Lawyer, 1976 Libertarian Presidential candidate
- MacLeod, Ken - Scottish science fiction writer, winner of the 1998 and 1996 Prometheus Awards
- Machan, Tibor R. - Professor of philosophy and business ethics, co-founder of Reason magazine
- Machlup, Fritz - 20th century Austro-American economist
- Mack, Richard - Former Sheriff of Graham County, Ariz., challenged "Brady Bill"
- Mackey, John - Founder, Chairman of the Board and CEO of Whole Foods Market, Inc.
- Madison, James - Author of Federalist essays, fourth President of the United States
- Madonna - American singer, dancer and actress
- Magicians - Prestidigitators and illusionists
- Maher, Bill - Host of HBO's "Real Time with Bill Maher," creator of Comedy Central/ABC's "Politically Incorrect"
- Malkin, Michelle - Syndicated columnist, recipient of 1998 Second Amendment Foundation's James Madison Award
- Malthus, Thomas - 18th/19th century English economist
- Mandela, Nelson - First President of South Africa after repeal of apartheid
- Mandeville, Bernard de - 18th century Dutch philosopher, physician and satirist
- Manion, Clarence E. - 20th century American, dean of the Law School at the University of Notre Dame
- Margot, Sandra - Married name of former pornographic actress and wrestler Tyfanny Million
- Markowitz, Harry M. - 20th century American economist, winner of the 1990 Nobel Prize in economics
- Marrou, Andre V. - 1992 Libertarian Presidential candidate, 1988 Vice Presidential candidate
- Marshall, Alfred - 19th century English economist
- Marshall, John - Fourth Chief Justice of the United States Supreme Court
- Marshall, Paul - American singer, guitar/bass player and songwriter
- Marx, Groucho - American Emmy-winning comedian, host of "You Bet Your Life"
- Marx, Harpo - American comedian, one of the Marx Brothers, noted for silent roles and harp playing
- Mason, George - Author of the Virginia Declaration of Rights
- Masters, Wiliam S. - Sheriff of San Miguel County, Colorado
- Matalin, Mary - Political commentator, co-host of CNN's "Crossfire", host of "The Mary Matalin Show"
- Mattern, Cody - Fencing instructor, winner of five national titles in épeé fencing
- May, Rex F. - Political cartoonist, pen-name: Baloo
- Maybury, Richard J. - Investment advisor and author
- McCain, John - Republican Senator from Arizona, 2008 Republican Presidential presumptive nominee
- McCarthy, Kevin - American film, stage and TV actor, star of Invasion of the Body Snatchers
 McElroy, Wendy - Author, individualist feminist- McGoohan, Patrick - American-born TV and film actor, creator of the British TV series "The Prisoner"
- McKinley, William - Twenty-fifth President of the United States
- McPherson, Scott - Policy Advisor to the Future of Freedom Foundation
- McWilliams, Peter - Author of the Life 101 books and Ain't Nobody's Business If You Do
- Means, Russell - American Indian Movement activist, actor, singer
- Melanie - American singer and songwriter
- Mellor, William H. - Co-founder, President and General Counsel of the Institute for Justice
- Mencken, Henry Louis - Journalist, author of The American Language
- Menger, Carl - Founder of the Austrian School of economics
- Mercer, Ilana - Freelance columnist, author of Broad Sides
- Meyer, Frank S. - 20th century American journalist, editor of National Review
- Michael, Terry - Founder and executive director of the Washington Center for Politics & Journalism
- Mill, James - 18th/19th century Scottish economist
- Mill, John Stuart - Nineteenth century British philosopher and economist
- Miller, Dennis - American stand-up comedian, Emmy award winner for "Dennis Miller Live"
- Miller, Vincent H. - President of the International Society for Individual Liberty
- Million, Tyfanny@ - Professional name of former porn actress Sandra Margot
- Milsted, Carl S., Jr. - Physicist, author, libertarian theoretical activist (self-described)
- Milton, John - 17th century English poet, author of Paradise Lost
- Milán, Victor - American science fiction writer, winner of the 1986 Prometheus Award
- Mises, Ludwig von - Austrian school economist
- Moby - American techno and dance musician
- Molinari, Gustave de - 19th century Belgian/French economist, considered the originator of market-anarchism
- Monteleone, Thomas F. - American novelist and editor, winner of Bram Stoker Award
- Montessori, Maria - Originator of the individualist Montessori educational method
- Moore, Adrian T - Executive Director of the Reason Public Policy Institute
- Moore, Carol - Libertarian activist, speaker and writer
- Moore, Stephen - President of the Free Enterprise Fund
- Morgenstern, Oskar - 20th century German-born economist
- Moriarty, Michael - American film and TV actor, winner of two Emmy Awards
- Morley, Felix M. - 20th century American journalist, editor of the Washington Post and Human Events
- Morley, Sean - Professional wrestler, a.k.a. Val Venis
- Morris, Robert - Signer of the U.S. Declaration of Independence, Articles of Confederation and Constitution
- Mosby, John S. - American Confederate fighter, known as the "Gray Ghost"
- Muller, Erich "Mancow" - Chicago-based syndicated radio "shock jock"
- Mullis, Kary B. - 1993 Nobel Prize in Chemistry for invention of the Polymerase Chain Reaction method
- Murdoch, Lachlan - Former Deputy Chief Operating Officer of News Corporation
- Murray, Bill - American comedian and movie and TV actor, Oscar-nominated for Lost in Translation
- Murray, Charles - Author, policy analyst, AEI scholar
- Musicians - Composers, singers or performers of music and songs
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