Dukes | Titles by Rank
- Dukes of Gallese
- Dukes of Galliera
- Dukes of Gandía-I
- Dukes of Gandia-II
- Dukes of Gandolfi
- Dukes of Garigliano
- Dukes of Gasconha
- Dukes of Gästrikland
- Dukes of Geldern
- Dukes of Genoa
- Dukes of Gillevoisin
- Dukes of Giordano
- Dukes of Giove
- Dukes of Giovenazzo
- Dukes of Girifalco
- Dukes of Girona
- Dukes of Giuliano
- Dukes of Glogau
- Dukes of Gloucester
- Dukes of Gloucester e Edinburgh
- Dukes of Glucksbierg
- Dukes of Glücksbierg
- Dukes of Gniezno
- Dukes of Gor
- Dukes of Gordon
- Dukes of Gordon
- Dukes of Görlitz
- Dukes of Göttland
- Dukes of Gottschee
- Dukes of Goyaz
- Dukes of Grafton
- Dukes of Gramont
- Dukes of Granada de Ega
- Dukes of Grande Polónia
- Dukes of Gravina
- Dukes of Grazzano Visconti
- Dukes of Greenwich
- Dukes of Grimaldi
- Dukes of Guadagnolo
- Dukes of Gualtieri
- Dukes of Guarda
- Dukes of Guardia Lombarda
- Dukes of Guastalla
- Dukes of Gueldres
- Dukes of Guimarães
- Dukes of Guise
- Dukes of Guyenne
- Dukes of Halland
- Dukes of Hälsingland
- Dukes of Hamilton