| Name of Family or Major Holdings -T- | Place of Origin |
| von Tangermünde | Ascania* |
| Tarento [prince of; Barcelona] | Iberia |
| Tarento and Antioch [prince of; Hautville] | Normandy -> Italy |
| de Tartas | Albret* |
| Teetgren | Finland -> Sweden |
| von Tetzloff | Bohemia, Sweden |
| Thott | Denmark/Sweden |
| de Thumery | France |
| Tiberias [prince of; Hautville] | Normandy -> Italy |
| Tiesen [Rosenhoff] | Germany & Sweden |
| Tillbakaseende Ulv | Sweden |
| Tjägne Karlssons Ätt | Sweden |
| Tordehumos y Medina de Rioseco [lady of; Barcelona] | Iberia |
| Tortosa [marquis of; Barcelona] | Iberia |
| Tott | Denmark/Sweden |
| Toulouse [count; cf Autun] | France |
| Tre Rosor till Mörby | Sweden |
| Trolle | Sweden -> Mexico & France |
| Trolle-Bonde [Bonde] | Sweden |
| Trotz | Sweden |
| Tuscany [Lucca] | Italy |
| Två Bjälkar från Sunnerbo | Sweden |
| Tyrgils Klemenssons Ätt [Färla V] | Sweden |
| Törne Matssons Ätt | Sweden |
| Törnqvist [Adelcrantz] | Sweden |