Barons | Titles by Rank
- Barons of Mauchenheim gen.Bechtoldsheim
- Barons of Mauley
- Barons of Maurício de Matias
- Barons of Mauron
- Barons of Mauvers
- Barons of Maxelrain
- Barons of Maxial
- Barons of Maxlrain
- Barons of Mazarino
- Barons of Mazzarino
- Barons of Mearim
- Barons of Mecejana
- Barons of Meester de Ravestein
- Barons of Meggau
- Barons of Meirargues
- Barons of Melgaço
- Barons of Mélisey
- Barons of Melo e Oliveira
- Barons of Mendes Tota
- Barons of Mendonça
- Barons of Menezes
- Barons of Mentzingen
- Barons of Mercês
- Barons of Merepi
- Barons of Meriti
- Barons of Merk
- Barons of Merode
- Barons of Mesnildurand
- Barons of Mesquita
- Barons of Mesquita-br
- Barons of Mettecoven
- Barons of Metternich-Winneburg
- Barons of Metternich-Winneburg-Beilstein
- Barons of Meuse
- Barons of Meuze
- Barons of Meyendorff
- Barons of Meyern-Hohenberg
- Barons of Mézières-en-Brenne
- Barons of Mezzograno
- Barons of Militello
- Barons of Minas Novas
- Barons of Miossans
- Barons of Miossens
- Barons of Mipibu
- Barons of Miracema
- Barons of Mirambeau
- Barons of Miranda
- Barons of Miranda do Corvo
- Barons of Miranda Reis
- Barons of Mirandela