- Tafel, Richard - Past Executive Director of the Log Cabin Republicans
- Taussig, Frank William - Early 20th century professor of economics at Harvard University
- Taylor, Joan Kennedy - Author, founding member of Feminists for Free Expression
- Teller - Shorter, quieter half of Penn and Teller magician duo
- Thatcher, Margaret - Prime Minister of the United Kingdom during the 1980s
- Theroux, David J. - Founder, President and CEO of The Independent Institute
- Thiel, Peter A. - Co-founder and former CEO of PayPal
- Thies, Clifford F. - Past chair of the Republican Liberty Caucus, professor of Economics and Finance
- Thomas, Clarence - Associate Justice of the U.S. Supreme Court since 1991
- Thompson, Ed - Former Mayor of Tomah and candidate for Governor of Wisconsin
- Thoreau, Henry David - Nineteenth-century American author, noted for the essay "Civil Disobedience"
- Thornton, Mark - Professor of economics, Senior Fellow at the Ludwig von Mises Institute
- Tiemann, Michael - Co-founder of Cygnus Solutions; Vice President, Open Source Affairs for Red Hat Inc.
- Timberlake, Richard H., Jr. - Emeritus Professor of Economics at the University of Georgia
- Tocqueville, Alexis de - Nineteenth century French historian, author of Democracy in America
- Tolkien, J. R. R. - 20th century English writer and professor of linguistics, author of The Lord of the Rings
- Traders and Investors - Short term speculators and longer term investment managers
- Tucker, Benjamin - American indivilualist anarchist, publisher of the 19th century Liberty periodical
- Tullock, Gordon - Professor of law and economics at George Mason University
- Turgot, Anne Robert Jacques - 18th century French economist
- Turner, Ted - Founder of the Cable News Network
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