Barons | Titles by Rank
- Barons of Mahuet
- Barons of Maia Monteiro
- Barons of Maigny
- Barons of Maillé
- Barons of Mailly
- Barons of Maisenberg
- Barons of Malda y Maldanell
- Barons of Maldeghem
- Barons of Maltzahn
- Barons of Maltzan
- Barons of Maltzan-Wartenberg
- Barons of Mamanguape
- Barons of Mambucaba
- Barons of Mamoré
- Barons of Manaus
- Barons of Manchi di Belici
- Barons of Mandelsloh
- Barons of Mandrascati
- Barons of Mangaratiba
- Barons of Mangiadaini
- Barons of Manique do Intendente
- Barons of Maracajú
- Barons of Maracanã
- Barons of Maragogipe
- Barons of Marajó
- Barons of Maraú
- Barons of Marauiá
- Barons of Marcilly
- Barons of Marignane
- Barons of Marinho
- Barons of Marmande
- Barons of Maroim
- Barons of Martorell
- Barons of Mascalbó
- Barons of Massarelos
- Barons of Massenbach
- Barons of Massiac
- Barons of Massy
- Barons of Mata Bacelar
- Barons of Matalha
- Barons of Mataripe
- Barons of Mathefelon
- Barons of Matos Vieira
- Barons of Matosinhos
- Barons of Matoso
- Barons of Mattei
- Barons of Matuim
- Barons of Mauá
- Barons of Mauchenheim
- Barons of Mauchenheim gen. Bechtolsheim