Marquesses | Titles by Rank
- Marquesses of Comillas
- Marquesses of Comín
- Marquesses of Commarque
- Marquesses of Conflans
- Marquesses of Constantina
- Marquesses of Contadero
- Marquesses of Conturbia
- Marquesses of Coquilla
- Marquesses of Corato
- Marquesses of Cordellas
- Marquesses of Coria
- Marquesses of Corleto
- Marquesses of Corsini
- Marquesses of Cortanze
- Marquesses of Cortés
- Marquesses of Cortes de Graena
- Marquesses of Cortina
- Marquesses of Corvera
- Marquesses of Coscojuela
- Marquesses of Cosnac
- Marquesses of Cossé
- Marquesses of Cossé-Brissac
- Marquesses of Cotron
- Marquesses of Courcelles
- Marquesses of Courcillon
- Marquesses of Courcy
- Marquesses of Courlans
- Marquesses of Courtanvault
- Marquesses of Courtavel
- Marquesses of Courtebonne
- Marquesses of Craon
- Marquesses of Crewe
- Marquesses of Croismare
- Marquesses of Croissy
- Marquesses of Crópani
- Marquesses of Cropony
- Marquesses of Croy
- Marquesses of Cruilles
- Marquesses of Cubas
- Marquesses of Cuéllar
- Marquesses of Cúllar de Baza
- Marquesses of Cullera
- Marquesses of Cumont
- Marquesses of Cunha
- Marquesses of Curton
- Marquesses of Cúsano
- Marquesses of d' Hautpoul
- Marquesses of d'Achy
- Marquesses of d'Esquirre
- Marquesses of Dalhousie