Dukes | Titles by Rank
- Dukes of Brunswick-Lüneburg-Hanover
- Dukes of Brunswick-Lüneburg-Hitzacker
- Dukes of Brunswick-Lüneburg-Oels
- Dukes of Brunswick-Osterode
- Dukes of Brunswick-Salz-der-Helden
- Dukes of Brunswick-Stettin
- Dukes of Brunswick-Wolfenbüttel
- Dukes of Bruzzano
- Dukes of Buccleuch
- Dukes of Buckingham
- Dukes of Buckingham e Chandos
- Dukes of Buckingham e Normanby
- Dukes of Buckingham-I
- Dukes of Büren
- Dukes of Burgundy
- Dukes of Caccuri
- Dukes of Cadaval
- Dukes of Cádiz (I)
- Dukes of Cádiz (II)
- Dukes of Cadore
- Dukes of Caianello
- Dukes of Caivano
- Dukes of Calábria
- Dukes of Calvello
- Dukes of Calvo Sotelo
- Dukes of Camastra
- Dukes of Cambridge
- Dukes of Cambridge-V
- Dukes of Camerino
- Dukes of Camiña
- Dukes of Caminha
- Dukes of Campagnano
- Dukes of Campo Alange
- Dukes of Canalejas
- Dukes of Candale
- Dukes of Canemorto
- Dukes of Cánovas del Castillo
- Dukes of Cantábria
- Dukes of Caraman
- Dukes of Carcaci
- Dukes of Cardona
- Dukes of Carinrthia
- Dukes of Caríntia
- Dukes of Carosino
- Dukes of Carpineto
- Dukes of Carrero Blanco
- Dukes of Cars
- Dukes of Casalanza
- Dukes of Casalaspro
- Dukes of Casalmaggiore