Viscounts | Titles by Rank
- Viscounts of Montalvo
- Viscounts of Montaner
- Viscounts of Montargil
- Viscounts of Montariol
- Viscounts of Montauban
- Viscounts of Monte Belo
- Viscounts of Monte Redondo
- Viscounts of Monte São
- Viscounts of Montedor
- Viscounts of Montenaken
- Viscounts of Monterrey
- Viscounts of Montessus de Ballore
- Viscounts of Montfa
- Viscounts of Monthalus
- Viscounts of Montlaur
- Viscounts of Montrichard
- Viscounts of Morais
- Viscounts of Morais Cardoso
- Viscounts of Morais Sarmento
- Viscounts of Morão
- Viscounts of Moreira de Rei
- Viscounts of Moreira Lima
- Viscounts of Moser
- Viscounts of Mossâmedes
- Viscounts of Mossoró
- Viscounts of Mota Maia
- Viscounts of Mountmorres of Castlemorres
- Viscounts of Moura
- Viscounts of Mozelos
- Viscounts of Murat
- Viscounts of Muriaé
- Viscounts of Muritiba
- Viscounts of Muruzabal de Andión
- Viscounts of Nacar
- Viscounts of Namur
- Viscounts of Nandufe
- Viscounts of Napier de São Vicente
- Viscounts of Nápoles e Lemos
- Viscounts of Narbonne
- Viscounts of Nava del Rey
- Viscounts of Nazaré
- Viscounts of Nazaré
- Viscounts of Nebouzan
- Viscounts of Negrelos
- Viscounts of Nevogilde
- Viscounts of Nieulant
- Viscounts of Nióaque
- Viscounts of Niterói
- Viscounts of Nivert
- Viscounts of Noailles