- Pacino, Al - American stage and movie actor, winner of Best Actor Oscar for Scent of a Woman
- 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
- Paul, Les - American guitarist, electric guitar designer
- Paul, Ron - Texas Republican Congressman, 1988 Libertarian Presidential candidate, 2008 Republican Presidential prospective candidate
- Pauling, Linus - Nobel Prize for Chemistry (1954) and Peace (1962)
- 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
- Phillies, George - Professor of physics, 2008 Libertarian Party presidential aspirant
- Philosophers - Students and teachers of fundamental principles
- Piazza, Mike - Baseball catcher with the New York Mets
- Pink, Daniel H. - Author, speaker, contributing editor at Wired magazine
- Platt, Charles - British born writer, author of The Silicon Man
- Poe, Richard - Freelance journalist, author of The Seven Myths of Gun Control
- Poirot, Paul L. - Editor of The Freeman (1956-1987)
- Politicians - People who hold or are running for a political office
- Ponte, Lowell - Co-host of "The Wise Guys" radio show on Genesis Communications
- Poole, Robert W., Jr. - Founder of Reason Magazine and the Reason Foundation
- Pope, Paul - American cartoonist and graphic novelist
- Popper, John - Singer and harmonica player with the Blues Traveler quartet
- 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
- Prodos - Originator of the Walk for Capitalism
- Professors and Teachers - Faculty members at schools, colleges and universities
- Pryce, Jonathan - British film and stage actor, starred as Sam Lowry in Brazil
- Psychologists and Psychiatrists - Non-medical and medical practitioners in the study of the mind and human behavior
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