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- Tamar of Georgia (1160-1213), Queen Regnant of Georgia from 1184 to 1213.
- Teodora Gallucio (1200–60), Countess of Teano
- Teresa of Castile, Countess of Portugal
- Teresa Alvarez de Azagra, Lady of Albaracin, c1281-c1283
- Teresa Antonia Manrique de Lara y Mendoza, 7th Marquesa de Canete, c1590.
- Teresa Martins de Menezes (1290?), 5th Lady of Alburquerque
- Teresa de Entenza (1300–1327), Countess of Urgel, 1309-1327
- Theodora (wife of Justinian I), Byzantine Empress, 527-548
- Theodora (11th century), Byzantine Empress, 1042, 1055-1056.
- Theodora Komnena, Empress of Trebizond, 1284-85.
- Tiburge I of Orange, (d.1150), also known as Tiburtia of Orange, Countess of Orange
- Tiburge II of Orange, Countess of ½ of Orange, 1173-82. Married Bertrand of Baux (d.1181).
- Tiburge III of Orange (d.1180), Countess of Orange
- Toda of Ribagorza (d.1011), Countess of Ribagorza
- Toda Galindez of Aragon (890-?), Countess of Sobrarbe
- Töregene (regent) (1241–1245), Khatun of the Mongol Empire
Read more about this topic: List Of Female Rulers And Title Holders