- Kahn, Alfred E. - Professor of economics, chairman of Civil Aeronautics Board in the late 1970s
- Kaminsky, Stuart M. - Novelist, screenwriter, biographer, recipient of Edgar Allan Poe Award for A Cold Red Sunrise
- Kauffman, Bill - Author, associate editor of The American Enterprise
- Kay, Karen - American romance novelist of Choctaw Indian descent
- Keaton, Diane - American film and stage actress, winner of Best Actress Oscar for Annie Hall
- Kelley, David - Founder and Executive Director of The Objectivist Center
- Kennedy Montgomery, Lisa - Former host of various MTV programs
- Kennedy, John F. - Thirty-fifth President of the United States
- Kingsley, Ben - British actor, Oscar winner for title role in Ghandi
- Kirzner, Israel M. - Professor of Economics at New York University
- Klausner, Manny - American lawyer, co-founding editor of Reason magazine
- Klein, Daniel B. - Associate Professor of Economics at Santa Clara University
- Knapp, Thomas L. - Publisher of Rational Review
- Knight, Frank H. - 20th century American economist of the Chicago School
- Koch, David - Executive VP of Koch Industries, 1980 Libertarian Vice Presidential candidate
- Koman, Victor - American science fiction writer, winner of the 1997, 1990 and 1988 Prometheus Awards
- Konkin, Samuel Edward, III - Proponent of agorism and author of the New Libertarian Manifesto
- Koontz, Dean - Bestselling novelist
- Kopel, David B. - Attorney, author, research director of the Independence Institute
- Kostelanetz, Richard - American writer, artist, critic and editor
- Kramer, Kenny - Stand-up comedian who inspired the Cosmo Kramer character in "Seinfeld"
- Krawchuk, Kenneth V. - Computer programmer, inventor, IT consultant, candidate for Pennsylvania Governor
- Kubby, Steve - Author, 1998 LP California Governor candidate, 2008 LP U.S. President aspirant
- Kwiatkowski, Karen - Retired U.S. Air Force lieutenant colonel, columnist for MilitaryWeek.com
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