Dukes | Titles by Rank
- Dukes of Erchie
- Dukes of Escalona
- Dukes of Esclignac
- Dukes of Eslavónia
- Dukes of Eslovénia
- Dukes of Esparta
- Dukes of Estissac
- Dukes of Estouteville
- Dukes of Estrées
- Dukes of Estremera
- Dukes of Etampes
- Dukes of Exeter
- Dukes of Exeter-I
- Dukes of Fabriago
- Dukes of Faial
- Dukes of Feltre
- Dukes of Ferentillo
- Dukes of Feria
- Dukes of Fernán Nuñez
- Dukes of Fernández-Miranda
- Dukes of Fernandina
- Dukes of Feroleto
- Dukes of Ferrara
- Dukes of Fiano
- Dukes of Ficalho
- Dukes of Fife
- Dukes of Finlândia
- Dukes of Firmacon
- Dukes of FitzJames
- Dukes of Flandres
- Dukes of Fleury
- Dukes of Florença
- Dukes of Florida
- Dukes of Flumeri
- Dukes of Fluneri
- Dukes of Fontanges
- Dukes of Forli
- Dukes of Fragnito
- Dukes of Francavilla
- Dukes of France
- Dukes of Franco
- Dukes of Francónia
- Dukes of Frías
- Dukes of Frisa
- Dukes of Frísia Oriental
- Dukes of Fronsac
- Dukes of Galdo
- Dukes of Galícia
- Dukes of Galisteo-II
- Dukes of Galisteo-S