Human beings, each considered as a single actor within society
- Kauffman, Bill - Author, associate editor of The American Enterprise
- Kay, Karen - American romance novelist of Choctaw Indian descent
- Kelley, David - Founder and Executive Director of The Objectivist Center
- Kennedy, John F. - Thirty-fifth President of the United States
- 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 III, Samuel Edward - Proponent of agorism and author of the New Libertarian Manifesto
- Kopel, David B. - Attorney, author, research director of the Independence Institute
- 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
- Kubrick, Stanley - American film director, notable for Dr. Strangelove, 2001: A Space Odissey and other works
- Kwiatkowski, Karen - Retired U.S. Air Force lieutenant colonel, columnist for MilitaryWeek.com
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