Dukes | Titles by Rank
- Dukes of Torremaggiore
- Dukes of Torres Novas
- Dukes of Touraine
- Dukes of Tourraine
- Dukes of Tourzel
- Dukes of Tovar
- Dukes of Trachenberg
- Dukes of Traetto
- Dukes of Trancoso
- Dukes of Trani
- Dukes of Transilvânia
- Dukes of Tresmes
- Dukes of Trévise
- Dukes of Troppau
- Dukes of Troppau e Jägerndorf
- Dukes of Trujillo
- Dukes of Tufara
- Dukes of Tursi
- Dukes of Uceda
- Dukes of Uglich
- Dukes of Ulmburg
- Dukes of Uppland
- Dukes of Urach
- Dukes of Urbino
- Dukes of Ursel
- Dukes of Urslingen
- Dukes of Uzès
- Dukes of Valencia
- Dukes of Valencia de Campos
- Dukes of Valentinois
- Dukes of Vallombrosa
- Dukes of Valois
- Dukes of Vandières
- Dukes of Värmland
- Dukes of Västerbotten
- Dukes of Västergötland
- Dukes of Västmanland
- Dukes of Vastogirardi
- Dukes of Vendôme
- Dukes of Ventadour
- Dukes of Ventignano
- Dukes of Veragua
- Dukes of Vila Real
- Dukes of Villafranca
- Dukes of Villafranca de los Caballeros
- Dukes of Villahermosa
- Dukes of Villarosa
- Dukes of Villars
- Dukes of Ville-Roy
- Dukes of Villena