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- Joseph Tabarlet (1900–1951) politician
- Kirk Talbot (born 1969) state representative from Jefferson Parish
- Elmer R. Tapper (1929-2011) politician
- Gregory Tarver (born 1946) civil rights activist; former state senator from Caddo Parish
- Albert Tate (1920–1986) state and federal judge
- Billy Tauzin (born 1943) US Representative and lobbyist
- F. Jay Taylor (born 1923) university president
- Ike Taylor (born 1980) cornerback for the Pittsburgh Steelers
- Jim Taylor (born 1935) Hall of Fame fullback, primarily with the Green Bay Packers
- Joe Gray Taylor (1920–1987) historian
- Richard Taylor (1826–1879) Confederate general
- Zachary Taylor (1784–1850) 12th US President, US Army general
- Garrett Temple (born 1986) point guard for the San Antonio Spurs
- Ricky Templet (born 1963) politician
- Byron Thames (born 1969) actor and musician, Father Murphy
- Jimmy G. Tharpe (1930–2008) clergyman, educator
- Roy R. Theriot (1914–1973) politician
- Ryan Theriot (born 1979) infielder for the San Francisco Giants
- Steve Theriot (born 1946) politician
- Gerald Theunissen (born 1933) banker, politician
- Ricky Thibeault (born 1976 or 1977) United States Navy EOD
- David Thibodaux (1953–2007) politician, educator, author
- Keith Thibodeaux (born 1950) actor
- David William Thomas (1876–1961) politician, educator, journalist, attorney
- Jerry A. Thomas (born 1953), politician, physician
- Lee Emmett Thomas (1866–1935), politician
- Mike Thomas (born 1987), wide receiver for the Jacksonville Jaguars
- Tyrus Thomas (born 1986) power forward for the Charlotte Bobcats
- C.W. Thompson (1890–1951) politician
- Francis C. Thompson (born 1941) politician and landowner
- Jeff R. Thompson (born c. 1964) politician
- Ken Thompson (born 1943), pioneer of computer science
- Lizzie P. Thompson (1894–1973) state representative
- Michael F. "Mike" Thompson (born 1942) politician and home builder
- Richard S. Thompson (1916–1997) state representative from Grant Parish
- Sandra Thompson (born 1946) politician and environmentalist
- T. Ashton Thompson (1916-1965) U.S. representative
- William Y. Thompson (born 1922) historian
- Tom Thornhill (born 1952) attorney and former state representative
- Marcus Thornton (born 1987) shooting guard for the New Orleans Hornets
- George H. Tichenor (1837–1923) surgeon, pioneer in antiseptics
- Stanley R. Tiner (born 1942) journalist
- Joseph F. Toomy (born 1948) politician
- David Toms (born 1967) golfer
- John Kennedy Toole (1937–1969) writer
- Ned Touchstone (1926–1988) Radical Right politician and publisher
- Wayne Toups (born 1958) musician
- Allen Toussaint (born 1938) musician, composer, record producer
- Thomas Taylor Townsend (born 1963) state representative
- Chet D. Traylor (born 1945) Associate justice of the Louisiana Supreme Court, 1997–2009
- David C. Treen (1928–2009) US Representative (1973–1980) and Governor of Louisiana (1980–1984)
- John S. Treen (born 1926) homebuilder and Republican politician
- Risley C. Triche (1927-2012), attorney; former state representative
- Robert O. Trout (1904–1995), sociologist
- James Wayne "Jim" Tucker (born 1964), politician; first Republican Speaker of the Louisiana House of Representatives since Reconstruction
- Robert Beall "Buddy" Tudor, Jr. (1935–2010) real estate developer
- Simon W. Tudor (1887–1956) businessman; educator
- Paul Tulane (1801–1887) businessman, philanthropist
- Ben Turpin (c. 1872–1940) silent film comedian
- Abner Drake Turner (1877–1953) politician
- Odessa Turner (born 1964) former NFL wide receiver
- Marshall H. Twitchell (1840–1905) politician, planter, diplomat
Read more about this topic: List Of People From Louisiana