M
- Madiau Abbey (Abbaye de Madiau), monks, Diocese of Saintes
- Maillezais Abbey (Abbaye de Maillezais or Abbaye Saint-Pierre de Maillezais), Diocese of Poitiers (Maillezais, Vendée)
- Malnoue Abbey (Abbaye de Malnoue), nuns, Diocese of Paris (Émerainville, Seine-et-Marne)
- Manlieu Abbey (Abbaye Notre-Dame de Manlieu), monks, Diocese of Clermont
- Le Mans (Diocese of Le Mans):
- Abbey of St. Peter, Le Mans otherwise Abbey of Saint Pierre de la Couture, Le Mans (Abbaye Saint-Pierre-de-la-Couture au Mans)
- Abbey of St. Vincent, Le Mans (Abbaye Saint-Vincent du Mans), monks, Diocese of Le Mans (Le Mans)
- Marchiennes Abbey (Abbaye de Marchiennes), monks, Diocese of Arras (Marchiennes, Nord)
- Marcilhac Abbey (Abbaye Saint-Pierre de Marcilhac), monks, Diocese of Cahors (Marcilhac-sur-Célé, Lot)
- Marmoutier Abbey, Tours (Abbaye de Marmoutier or Abbaye Saint-Martin de Marmoutier), monks, Diocese of Tours (Tours, Indre-et-Loire)
- Marmoutier Abbey (Alsace) (Abbaye de Marmoutier), monks (Marmoutier, Bas-Rhin)
- Marnes Abbey or Saint-Jouin-de-Marnes Abbey (Abbaye de Marnes or Abbaye de Saint-Jouin-de-Marnes) monks, Diocese of Poitiers (Marnes, Deux-Sèvres)
- Maroilles Abbey (Abbaye de Maroilles), monks, Diocese of Cambrai
- Marseille (Bouches-du-Rhône) Diocese of Marseille:
- Abbey of St. Victor, Marseille (Abbaye de Saint-Victor de Marseille), monks, Diocese of Marseille (Marseille, Bouches-du-Rhône)
- Marseille Priory, otherwise Priory of St. Madeleine, Marseille (Prieuré Saint-Madeleine de Marseille): see Hautecombe Abbey
- Mas-d'Azil Abbey (Abbaye du Mas-d'Azil), monks, Diocese of Rieux
- Massay Abbey (Abbaye Saint-Martin de Massay), monks, Diocese of Bourges (Massay, Cher)
- Maubeuge Abbey (Abbaye de Maubeuge), nuns, Diocese of Cambrai
- Maumont Abbey (Abbaye Sainte-Marie de Maumont), nuns (Juignac, Charente)
- Maurs Abbey (Abbaye Saint-Césaire de Maurs), monks, Diocese of Saint-Flour (Maurs, Cantal)
- Maursmunster Abbey, monks, Diocese of Strasbourg = Marmoutier Abbey (Alsace)
- Mauzac Abbey (Abbaye Saint-Pierre de Mauzac), monks, Diocese of Clermont
- Maylis Abbey (Abbaye Notre-Dame de Maylis), monks (Landes)
- Maymac Abbey (Abbaye Saint-Léger de Maymac), monks, Diocese of Limoges
- Melun Abbey (Abbaye Saint-Pierre de Melun), monks, Diocese of Sens
- Menat Abbey (Abbaye Saint-Sauveur, Notre-Dame et Saint-Martin de Menat), monks, Diocese of Clermont (Menat, Puy-de-Dôme)
- Méobecq Abbey otherwise Meaubec Abbey (Abbaye Saint-Pierre et Saint-Paul de Méobecq or Abbaye de Méobecq or Meaubec) Diocese of Bourges (Méobecq, Indre)
- Metz (Diocese of Metz):
- Abbey of St. Glossindis, Metz (Abbaye Sainte-Glossinde de Metz), nuns
- Abbey of St. Vincent, Metz (Abbaye Saint-Vincent de Metz), monks
- Meymac Abbey (Abbaye Saint-André de Meymac or Abbaye Saint-André et Saint-Léger de Meymac) (Meymac, Corrèze)
- Micy Abbey (Abbaye de Micy or Abbaye de Saint-Mesmin de Micy), monks, Diocese of Orléans
- Moiremont Abbey otherwise Moirmont Abbey (Abbaye de Moiremont or Abbaye Saint Calocère et Saint-Parthénius de Moiremont or Moirmont), monks, Diocese of Châlons-sur-Marne (Moiremont, Marne)
- Moissac Abbey (Abbaye de Moissac, Abbaye de Saint-Pierre de Moissac or Abbaye Saint-Pierre et Saint-Paul de Moissac), monks, Diocese of Cahors (Moissac, Tarn-et-Garonne)
- Molesme Abbey (Abbaye Notre-Dame de Molesme), monks, Diocese of Langres
- Mollégès Abbey (Abbaye Sainte-Marie de Mollégès) (Mollégès, Bouches-du-Rhône)
- Monastier-Saint-Chaffre Abbey (Abbaye du Monastier-Saint-Chaffre), monks, Diocese of Le Puy
- Mont Saint-Michel Abbey (Abbaye du Mont Saint-Michel), monks, Diocese of Avranches (Mont Saint-Michel, Manche)
- Mont-Saint-Quentin Abbey (Abbaye du Mont-Saint-Quentin), monks, Diocese of Noyon
- Montceau Abbey (Abbaye Saint-Félix de Montceau), nuns, Diocese of Montpellier (Gigean, Hérault)
- Montebourg Abbey (Abbaye de Montebourg or Abbaye Sainte-Marie de Montebourg), monks, Diocese of Coutances (Montebourg, Manche)
- Montier-en-Der Abbey (Abbaye de Montier-en-Der or Montiérender), monks, Diocese of Châlons-sur-Marne
- Montiéramey Abbey (Abbaye de Montiéramey), monks (Montiéramey, Aube)
- Montierneuf Abbey (Abbaye Saint-Jean de Montierneuf) (Poitiers)
- Montivillers Abbey (Abbaye de Montivilliers), nuns, later monks, later nuns again, Diocese of Rouen (?-1792) (Montivilliers, Seine-Maritime)
- Montolivet Abbey (Abbaye de Montolivet), monks, Diocese of Carcassonne
- Montmajour Abbey (Abbaye de Montmajour or Abbaye Saint-Pierre de Montmajour), monks, Diocese of Arles
- Montmartre Abbey (Abbaye de Montmartre), nuns, Diocese of Paris
- Montolieu Abbey (Abbaye Saint-Jean-Baptiste de Montolieu), Diocese of Carcassonne (Montolieu, Aude)
- Montsor Abbey (Abbaye de Montsor), nuns, Diocese of Le Mans
- Moreaux Abbey (Abbaye de Moreaux), monks, Diocese of Poitiers
- Moreuil Abbey (Abbaye de Moreuil), monks, Diocese of Amiens
- Morienval Abbey (Abbaye de Morienval), nuns, Diocese of Soissons
- Morigny Abbey (Abbaye de Morigny), monks, Diocese of Sens
- Moustier-la-Celle Abbey (Abbaye de Moustier-la-Celle), monks, Diocese of Troyes
- Moustier-Ramey Abbey (Abbaye de Moustier-Ramey), monks, Diocese of Troyes
- Moutier-Saint-Jean Abbey otherwise Réomé Abbey (Abbaye de Moutier-Saint-Jean or Abbaye de Réomé), monks, Diocese of Langres
- Mouzon Abbey (Abbaye Notre-Dame de Mouzon), monks, Diocese of Reims (Mouzon, Ardennes)
- Moyenmoutier Abbey otherwise St. Hydulphe's Abbey (Abbaye de Moyen-Moutier or Abbaye Saint-Hydulphe de Moyenmoutier), monks, Diocese of Saint-Dié
- Mozac Abbey (Abbaye de Mozac or Abbaye Saint-Pierre et Saint-Caprais de Mozac) (Mozac, Puy-de-Dôme)
- Munster Abbey otherwise Münster Abbey (Abbaye de Munster or Münster), monks (Munster, Haut-Rhin)
- Murbach Abbey (Abbaye de Murbach), monks (Murbach, Haut-Rhin)
Read more about this topic: List Of Benedictine Monasteries In France