- Thiazines
- Thiazoles
- Thibaudeau, Clair Antoine, Comte
- Thibaut IV.
- Thibaut, Anton Friedrich Justus
- Thibaw
- Thielmann, Johann Adolf, Freiherr von
- Thierry
- Thiers, Louis Adolphe
- Thiers
- Thiersch, Friedrich Wilhelm
- Thietmar of Merseburg
- Thimble
- Thiophen
- Thirlby, Thomas
- Thirlwall, Connop
- Thirsk
- Thirty Years' War
- Thistle
- Thistlewood, Arthur
- Thököly, Imre
- Tholobate
- Tholos
- Tholuck, Friedrich August Gottreu
- Thoma, Hans
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- Thomar
- Thomas, St
- Thomas à Kempis
- Thomas (archbishop)
- Thomas Magister
- Thomas of Celano
- Thomas of Erceldoune
- Thomas of Margā
- Thomas, Arthur Goring
- Thomas, Charles Louis Ambroise
- Thomas, George
- Thomas, George Henry
- Thomas, Isaiah
- Thomas, Pierre
- Thomas, Sidney Gilchrist
- Thomas, Theodore
- Thomas, William
- Thomasius, Christian
- Thomason, George
- Thomasville
- Thomond, Earl and Marquess of
- Thompson, Francis
- Thompson, Sir Henry
- Thompson, Sir John Sparrow
- Thompson, Launt
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- Thompson, Thomas Peronnet
- Thompson, William Hepworth
- Thomsen, Grímur
- Thomsen, Hans Peter Jörgen Julius
- Thomson, Sir Charles Wyville
- Thomson, James (poet, 1700-1748)
- Thomson, James (poet, 1834-1882)
- Thomson, James (physicist)
- Thomson, John
- Thomson, Joseph
- Thomson, Thomas
- Thomson, William
- Thor
- Thorax
- Thorbecke, Jan Rudolf
- Thoreau, Henry David
- Thorfinn Karlsefni
- Thorianite
- Thorite
- Thorium
- Thorn (town)
- Thorn (botany)
- Thornaby-on-Tees
- Thorne
- Thornhill, Sir James
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- Thornhill (England)
- Thornhill (Scotland)
- Thornton, Henry
- Thornton, William Thomas
- Thornycroft, William Hamo
- Thóroddsen, Jón Þor Ðarson
- Thoroton, Robert
- Thorpe, Benjamin
- Thorpe, John
- Thorwaldsen, Bertel
- Thoth
- Thou, Jacques Auguste de
- Thouars
- Thouret, Jacques Guillaume
- Thousand and One Nights
- Thrace
- Thrall
- Thrasea Paetus, Publius Clodius
- Thrashing
- Thrasybulus
- Thrasymedes
- Thread
- Threat
- Three Bodies, Problem of
- Three Rivers
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