Human beings, each considered as a single actor within society
  • Paglia, Camille - American writer, author of Sexual Personae, professor of humanities
  • Paine, Thomas - American Revolutionary leader, author of the Common Sense pamphlet
  • Parker, Trey - Co-creator and executive producer of "South Park"
  • Paterson, Isabel - Canadian-born, American literary critic, author of The God of the Machine
  • Pauling, Linus - Nobel Prize for Chemistry (1954) and Peace (1962)
  • Paul, Ron - Texas Republican Congressman, 1988 Libertarian Presidential candidate, 2008 Republican Presidential prospective candidate
  • Pearson, Durk - Pioneer in life extension, expert in anti-aging research and brain biochemistry
  • Peart, Neil - Drummer and lyricist for the Rush rock band
  • Peikoff, Leonard - World's foremost authority on Objectivism
  • Peters, Tom - Management guru, co-author of In Search of Excellence
  • Philosophers - Students and teachers of fundamental principles
  • Pink, Daniel H. - Author, speaker, contributing editor at Wired magazine
  • Poirot, Paul L. - Editor of The Freeman (1956-1987)
  • Politicians - People who hold or are running for a political office
  • Poole, Robert W., Jr. - Founder of Reason Magazine and the Reason Foundation
  • Pope, Paul - American cartoonist and graphic novelist
  • Popper, Karl - 20th century Austrian-born British philosopher
  • Postrel, Virginia - Author, columnist, former editor of Reason magazine
  • Pournelle, Jerry - Co-winner (with Larry Niven and Michael Flynn) of 1992 Prometheus Award
  • Powell, Jim - Historian, author of The Triumph of Liberty
  • Pratchett, Terry - British science fiction and fantasy author, winner of 2003 Prometheus Award
  • Prechter, Robert - Financial writer, expert on the Elliott Wave forecasting theory
  • Presley, Sharon - Psychologist, executive director of Resources for Independent Thinking
  • Professors and Teachers - Faculty members at schools, colleges and universities
  • Psychiatrists - Medical practitioners in the study of the mind and human behavior
  • Psychologists and Psychiatrists - Non-medical and medical practitioners in the study of the mind and human behavior