| [A745] | Antonio Tempesta (1555 - 5 August 1630) | person | designer, printmaker |
| [A2454] | Tetricus I (Roman emperor) (fl. 271 - 274) | person | represented actor |
| [A3126] | Tetricus II (fl. 271-274) | person | represented actor |
| [A3861] | Teubner | corporate actor | printer |
| [A1933] | Anna Tęczyńska née Bogusz (16th c.) | person | dedicatee, represented actor |
| [A1681] | Andrzej Tęczyński (ca 1480 - 25 December 1561) | person | represented actor |
| [A1061] | Jan Tęczyński (1492 - 8/21 July 1541) | person | dedicatee, represented actor |
| [A2937] | Stanisław Gabriel Tęczyński (27 March 1514 - 5 December 1561) | person | |
| [A1540] | Thales of Miletus (ca 620 BCE - ca 545 BCE) | person | represented actor |
| [A3860] | Johann Thaller (16/17th c.) | person | |
| [A1209] | The Holy Trinity Convent in Cracow (Dominican) | corporate actor | |
| [A1567] | Themistocles (ca 524 BCE - ca 459 BCE) | person | represented actor |
| [A2888] | Jacobus Theodorus (1522/1525 - 1590) | person | |
| [A2455] | Theodosius I (Roman emperor) (11 January 347 - 17 January 395) | person | represented actor |
| [A2456] | Theodosius II (Roman emperor) (10 April 401 - 28 July 450) | person | represented actor |
| [A2457] | Theodosius III (Byzantine emperor) (died after 717 : fl. 715 - 717) | person | represented actor |
| [A1559] | Theophrastus (ca 371 BCE - ca 287 BCE) | person | represented actor |
| [A491] | André Thevet (1516 - 23 November 1590) | person | author |
| [A3366] | Jean Charles Thiébault de Laveaux | person | |
| [A3786] | Denis Thierry (died 12 November 1712) | person | |
