Dukes | Titles by Rank
- Dukes of Auerstaedt
- Dukes of Aumale
- Dukes of Aumale-I
- Dukes of Aumont
- Dukes of Áustria
- Dukes of Auvergne
- Dukes of Aveiro
- Dukes of Aveyro
- Dukes of Ávila e Bolama
- Dukes of Ayen
- Dukes of Badajoz-I
- Dukes of Badajoz-II
- Dukes of Badoglio
- Dukes of Baena
- Dukes of Bagnara
- Dukes of Bagnoli
- Dukes of Bagnolo
- Dukes of Bailén
- Dukes of Baixa Baviera
- Dukes of Baixa Borgonha
- Dukes of Baixa Lorena
- Dukes of Baños-I
- Dukes of Baños-II
- Dukes of Baños-III
- Dukes of Bar
- Dukes of Baranello
- Dukes of Barcelos
- Dukes of Bari
- Dukes of Bavaria
- Dukes of Bavaria-Ingolstadt
- Dukes of Bavaria-Landshut
- Dukes of Bavaria-Munique
- Dukes of Beaufort
- Dukes of Beaufort-II
- Dukes of Beaufort-Spontin
- Dukes of Beaumont
- Dukes of Bedford
- Dukes of Bedford-I
- Dukes of Bedford-II
- Dukes of Bedford-III
- Dukes of Beja
- Dukes of Béjar
- Dukes of Belcastro
- Dukes of Bellosguardo
- Dukes of Bellune
- Dukes of Belvedere
- Dukes of Benavente
- Dukes of Benavente-a
- Dukes of Berg
- Dukes of Bergamo