Encyclopedias, Almanacs, Transcripts, and Maps
- Thomas Wright Waller
- Thomas, Danny
- Thomas, George H.
- Thomas, J. H.
- Thomas, John
- Thompson's Pennsylvania Rifle Battalion
- Thompson, Benjamin Count Rumford
- Thompson, Tommy
- Thompson, William
- Thorez, Maurice (1900–1964)
- Thorndike, Sybil
- Thornton, Matthew
- Thorpe, (John) Jeremy
- Those Who Strove for Peace
- Three-Field System
- Three-Sided States
- Throg's Neck, New York
- Thruston's Regiment
- Thruston, Charles Mynn
- Thurman Wesley Arnold