Marquesses | Titles by Rank
- Marquesses of Mancera
- Marquesses of Manneville
- Marquesses of Manoeuvre
- Marquesses of Mantua
- Marquesses of Manzanedo
- Marquesses of Maranhão
- Marquesses of Marañón
- Marquesses of Maranzana
- Marquesses of March
- Marquesses of Marchelina
- Marquesses of Marcieu
- Marquesses of Márgena
- Marquesses of Marialva
- Marquesses of Marianao
- Marquesses of Maricá
- Marquesses of Marignane
- Marquesses of Marin
- Marquesses of Marineo
- Marquesses of Mariño
- Marquesses of Marino
- Marquesses of Maro
- Marquesses of Marqueyssac
- Marquesses of Marsillac
- Marquesses of Martínez de Campos
- Marquesses of Martorell
- Marquesses of Marzales
- Marquesses of Mascarell de San Juan
- Marquesses of Masebradi
- Marquesses of Massa
- Marquesses of Massa Luense
- Marquesses of Masserano
- Marquesses of Matallana
- Marquesses of Matharel
- Marquesses of Matonte
- Marquesses of Maubec
- Marquesses of Maulévrier
- Marquesses of Mauny
- Marquesses of Maupeou-Monbail
- Marquesses of Mazan
- Marquesses of Medina
- Marquesses of Meinières
- Marquesses of Mejorada del Campo
- Marquesses of Melgar
- Marquesses of Melgarejo
- Marquesses of Meli Lupi Tarasconi
- Marquesses of Melín
- Marquesses of Melitelo
- Marquesses of Mena Hermosa
- Marquesses of Mendia
- Marquesses of Mendigorría