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- Maagdendale Abbey (Abdij van Maagdendale) at Oudenaarde (East Flanders): Cistercian nuns
- Maegdendael Abbey (Abdij van Maegdendael) at Oplinter (Flemish Brabant): Cistercian nuns
- Malmedy Abbey (Abbaye de Malmedy) at Malmedy (Liège): Benedictine monks
- Malonne Abbey (Abbaye Notre-Dame de Malonne) (dissolved) at Malonne (Namur): Benedictine monks
- Marche-les-Dames Abbey (Abbaye de Marche-les-Dames or Abbaye de Notre-Dame du Vivier) at Marche-les-Dames (Namur): women's community of no known order until c. 1235, then Cistercian nuns to 1856; Sisters of St. Vincent de Paul to 1880, Ursulines to 1914, Carmelite sisters to 1973; non-religious boarding school to 1980; the Little Sisters of Bethlehem to 2000; now occupied by the lay community Madonna House
- Maredret Abbey (Abbaye de Maredret) (extant) at Anhée (Namur): Benedictine nuns
- Maredsous Abbey (Abbaye de Maredsous) (extant) at Denée (Namur): Benedictine monks
- Menin Abbey (Abbaye Notre-Dame-de-la-Paix de Menin or Abbaye des Saints-Anges) at Menen (Menin) (West Flanders): Benedictine nuns
- Merkem Abbey (Abbaye Saint-Pierre-et-Notre-Dame de Merkem) at Merkem (West Flanders): Benedictine nuns
- Mesen Abbey or Messines Abbey (Abbaye Notre-Dame de Messines) at Mesen (Messines) (West Flanders): Benedictine nuns
- Mons Abbey (Abbaye de la Paix-Notre-Dame de Mons) at Mons (Hainaut): Benedictine nuns
- Mont César Abbey (Abbaye du Mont César), see Keizersberg Abbey
- Mont Cornillon, see Cornillon Abbey
- Mont-d'Or Abbey (Abbaye du Mont-d'Or) at Wevelgem (West Flanders): Cistercian nuns
- Moorsel Abbey (Abbaye de Moorsel) at Moorsel, Aalst (East Flanders): Benedictine nuns
- Moulins-Warnant Abbey (Abbaye de Moulins-Warnant) at Anhée (Namur): community of women (no known rule), then Cistercian nuns 1233-1414, then Cistercian monks
- Munsterbilzen Abbey (Abbaye Saint-Amour de Munsterbilzen) at Munsterbilzen, Bilzen (Limburg): Benedictine nuns
Read more about this topic: List Of Christian Religious Houses In Belgium