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- Maizières Abbey, monks, diocese of Chalon-sur-Saône
- Marcilly Abbey, monks, diocese of Autun
- Marquette Abbey (also known as Bonrepos Abbey), nuns, diocese of Tournai
- Maubuisson Abbey (Abbaye de Maubuisson or Abbaye Notre-Dame la Royale de Maubuisson), nuns, diocese of Rouen, later diocese of Paris (1236-?) (Saint-Ouen-l'Aumône, Val d'Oise)
- Mazan Abbey, monks, diocese of Viviers (Mazan-l'Abbaye, Ardèche)
- Mègemont Abbey, nuns, later monks, diocese of Clermont (Chassagne, Puy-de-Dôme)
- Melleray Abbey (Abbaye Notre-Dame de Melleray), monks, diocese of Nantes (La Meilleraye-de-Bretagne, Loire-Atlantique)
- Merci-Dieu Abbey, diocese of Poitiers
- Mercoire Abbey, nuns, diocese of Mende, Lozère
- Micy Abbey or Saint Mesmin's Abbey, Micy (Abbaye Saint-Mesmin de Micy) (Feuillants : 1622-1791) (Saint-Pryvé-Saint-Mesmin, Loiret)
- Le Miroir Abbey (Abbaye Notre-Dame du Miroir), monks, diocese of Lyon (Le Miroir, Saône-et-Loire)
- Molèze Abbey, nuns, diocese of Chalon-sur-Saône
- Mologèze Abbey (Abbaye Notre-Dame de Mologèze), nuns, diocese of Arles
- Moncé Abbey, nuns, diocese of Tours
- Monstier-en-Argonne Abbey, monks, diocese of Châlons-sur-Marne
- Mont des Cats Abbey (Abbaye du Mont des Cats or Abbaye Sainte-Marie du Mont des Cats), monks (Godewaersvelde, Nord)
- Mont-Sainte-Marie Abbey, monks, diocese of Besançon (Doubs)
- Mount Zion Abbey (Abbaye du Mont de Sion), nuns, diocese of Marseille
- Montpeyroux Abbey, monks, diocese of Clermont (Puy-Guillaume, Puy-de-Dôme)
- Montreuil Abbey (Abbaye de Montreuil-les-Dames or Montreuil-en-Thiérache, later Montreuil-sous-Laon), nuns, diocese of Laon (Laon, Aisne)
- Moreilles Abbey (also Moreil Abbey), diocese of La Rochelle
- Mores Abbey, monks, diocese of Langres
- Morimond Abbey, monks, diocese of Langres (formerly Fresnoy-en-Bassigny, now Parnoy-en-Bassigny, Haute-Marne)
- Mortemer Abbey, monks, diocese of Rouen (Lisors, Eure)
- Mouchy-le-Péreux Abbey, nuns, diocese of Beauvais
Read more about this topic: List Of Cistercian Monasteries In France