Encyclopedias, Almanacs, Transcripts, and Maps
- Thomas, Clarence (1948–)
- Thompson v. Oklahoma 487 U.S. 815 (1988)
- Thompson, Smith (1763–1843)
- Thornburgh v. American COllege of Obstetricians and Gynecologists 476 U.S. 747 (1986)
- Thornhill v. Alabama 310 U.S. 88 (1940)
- Thornton v. Caldor, Inc. 472 U.S. 703 (1985)
- Thorpe, Francis N. (1857–1926)
- Three-Fifths Clause
- Three-Judge Court
- TIA (Terrorism Information Awareness)
- Tiedeman, Christopher G. (1857–1903)
- Timmons v. Twin Cities Area New Party 520 U.S. 351 (1997)
- Tinker v. Des Moines Independent Community School District 393 U.S. 503 (1969)
- Tissue-Based Biosensors
- Titles of Nobility
- Tocqueville, Alexis De (1805–1859)
- Todd, Thomas (1765–1826)
- Toleration Act 1 William & Mary Ch. 18 (1689)
- Toombs, Robert A. (1810–1885)
- Toomer v. Witsell 334 U.S. 385 (1948)