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- Joe Tait, broadcaster who did radio play by play for the Cleveland Cavaliers
- Jill Talley, actress, voice actress, Little Miss Sunshine, The Boondocks, Mr. Show
- Antwon Tanner, actor, One Tree Hill
- Mark Tatge, journalist
- Edmund Dick Taylor, "Father of the Greenback"
- Lili Taylor, actress, Six Feet Under, Deadline, Ransom
- Andy Tennant, actor, writer, film director, Hitch
- Felisha Terrell, actress, Days of our Lives
- Lynne Thigpen, actress, Where in the World Is Carmen Sandiego?, All My Children
- Roy Thinnes, actor, The Invaders, The Long, Hot Summer, Falcon Crest
- Josh Thole, catcher for the New York Mets
- Pierre Thomas, running back for the New Orleans Saints
- Theodore Thomas, violinist, orchestral conductor and founder of the Chicago Symphony Orchestra
- Jim Thome, player for the Baltimore Orioles
- Charles Tillman, cornerback for the Chicago Bears
- Gregg Toland, cinematographer
- Scott Tolzien, quarterback for the San Francisco 49ers
- David Tom, actor, The Young and the Restless, All My Children
- Lauren Tom, film & TV actress, voice actress, King of the Hill, Futurama, W.I.T.C.H.
- Nicholle Tom, actress, The Nanny, The Minor Accomplishments of Jackie Woodman
- Tom Towles, actor
- Robert Townsend, actor and director, The Parent 'Hood
- Mary Ellen Trainor, actress, Roswell, Parker Lewis Can't Lose, the Lethal Weapon films
- Sam Treiman, theoretical physicist
- Lyman Trumbull, politician (Democrat, Republican), Illinois Assembly member, Illinois Supreme Court Justice, U.S. Senator, author of the Thirteenth Amendment
- Robin Tunney, actress, The Mentalist, Prison Break
- Bob Turley, Cy Young-winning pitcher, primarily with the New York Yankees
- Jonathan Baldwin Turner, scholar, activist and advocate of land grant universities
- Evan Turner, shooting guard for the Philadelphia 76ers
- Michael Turner, NFL running back for the Atlanta Falcons
- Scott Turow, author and lawyer
- Twista, rapper
- R. Emmett Tyrrell, Jr., founder and editor-in-chief of The American Spectator
Read more about this topic: List Of People From Illinois