Marquesses | Titles by Rank
- Marquesses of Bilbao-Eguía
- Marquesses of Biron
- Marquesses of Bismantova
- Marquesses of Bissy
- Marquesses of Bitetto
- Marquesses of Bitonto
- Marquesses of Bizemont
- Marquesses of Blainville
- Marquesses of Blanco Hermoso
- Marquesses of Blandford
- Marquesses of Blanford
- Marquesses of Blangy
- Marquesses of Blegua
- Marquesses of Blénac
- Marquesses of Blisterwick
- Marquesses of Boadilla del Monte
- Marquesses of Boccheggiano
- Marquesses of Boesse
- Marquesses of Bogaraya
- Marquesses of Boil
- Marquesses of Boisgelin
- Marquesses of Boisséson
- Marquesses of Boissy
- Marquesses of Bolaños
- Marquesses of Bolarque
- Marquesses of Bomy
- Marquesses of Bonacorso
- Marquesses of Bonanaro
- Marquesses of Bonanza
- Marquesses of Bondad Real
- Marquesses of Bonneval
- Marquesses of Bons
- Marquesses of Boquestan
- Marquesses of Borba
- Marquesses of Borghetto
- Marquesses of Borgo San Dalmazzo
- Marquesses of Borgomanero
- Marquesses of Borja
- Marquesses of Bosch de Arés
- Marquesses of Bouc
- Marquesses of Bouillé
- Marquesses of Boulainvilliers
- Marquesses of Bourbon-Conti
- Marquesses of Bournonville
- Marquesses of Bousies
- Marquesses of Bouvignies
- Marquesses of Bouzols
- Marquesses of Bóveda de Limia
- Marquesses of Boves
- Marquesses of Bovino