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- Magdenau Abbey at Wolfertswil, Degersheim (St. Gallen): Cistercian nuns
- La Maigrauge Abbey / Magerau Abbey (Fribourg): Cistercian nuns
- Maria Hilf, on the Gubel, Menzingen (Zug): Capuchin Sisters
- Maria-Rickenbach at Niederrickenbach (Nidwalden): Benedictine nuns
- Mariastein Abbey, also known as Beinwil-Mariastein Abbey, at Metzerlen-Mariastein (Solothurn): Benedictine monks
- Mariazell, see Beerenberg
- Mariazell-Wurmsbach Abbey, see Wurmsbach
- Melchtal Abbey at Kerns (Obwalden): Benedictine nuns
- Mistail Abbey (dissolved) at Alvaschein (Graubünden): Benedictine nuns
- Mount Zion Abbey (Stift Berg Sion) at Gommiswald (St. Gallen): Premonstratensian nuns
- Moutier-Grandval Abbey (dissolved) in Moutier (Berne): Benedictine monks
- Montheron Abbey (dissolved) at Montheron in Froideville near Lausanne (Vaud): Cistercian monks
- Münchenbuchsee Commandery (dissolved) at Münchenbuchsee (Berne): Knights Hospitallers
- Münchenwiler Priory (dissolved) at Schloss Münchenwiler (Berne): Cluniacs
- Münsterlingen at Landschlacht (Thurgau): Benedictine nuns
- Muri Abbey at Muri (Aargau) (dissolved): Benedictine monks
Read more about this topic: List Of Christian Religious Houses In Switzerland