Viscounts | Titles by Rank
- Viscounts of Martigues
- Viscounts of Marzovelos
- Viscounts of Mason de São Domingos
- Viscounts of Massamá
- Viscounts of Matalha
- Viscounts of Mato
- Viscounts of Mauá
- Viscounts of Maurienne
- Viscounts of Mayrink
- Viscounts of Meaux
- Viscounts of Mecejana
- Viscounts of Méharin
- Viscounts of Meireles
- Viscounts of Melfort
- Viscounts of Melício
- Viscounts of Melo Barreto
- Viscounts of Melun
- Viscounts of Mendinueta
- Viscounts of Menezes
- Viscounts of Mentque
- Viscounts of Merceana
- Viscounts of Meriti
- Viscounts of Mesquita
- Viscounts of Mesquitela
- Viscounts of Messangil
- Viscounts of Messines
- Viscounts of Midões
- Viscounts of Milhundos
- Viscounts of Mindelo
- Viscounts of Mira Vouga
- Viscounts of Mirabeau
- Viscounts of Miragaia
- Viscounts of Miranda
- Viscounts of Miranda do Corvo
- Viscounts of Mirandela
- Viscounts of Mirandela
- Viscounts of Mirandela
- Viscounts of Miravalles
- Viscounts of Mogofores
- Viscounts of Moimenta da Beira
- Viscounts of Molelos
- Viscounts of Monbas
- Viscounts of Monção
- Viscounts of Monforte
- Viscounts of Monsanto
- Viscounts of Monsaraz
- Viscounts of Monserrate
- Viscounts of Monserrate
- Viscounts of Montalegre
- Viscounts of Montalegre-br