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