A-List & Notable:
* Taraji P. Henson
* Charlize Theron
* Emma Thompson
* Michelle Trachtenberg
* Uma Thurman
* Cicely Tyson
Other Notables:
* Mia Talerico
* Holland Taylor
* Cara Theobold
* Ruthie Ann Miles
* Anna Torv
* Kristen Stewart (Technically, her last name is Stewart, but it's often stylized as "Kristen Stewart")
Less Familiar but Still Accomplished:
* T'Chara McDowell
* Tamsin Greig
* Rosalind Tarrant
* Tracy Spiridakos
* Sophie Turner
* Taylor Schilling
This list is not exhaustive, but it offers a variety of actresses whose last names start with the letter T. There are many more talented actresses out there, and I encourage you to do some research to discover them!