Disentis Abbey (German: Reichskloster Disentis) is a Benedictine monastery in the Canton of Grisons in eastern Switzerland , around which the present town of Disentis (Romansh: Mustér) grew up.

Formerly the date of the foundation of this abbey, attributed to the local saints Placidus and Sigisbert, was held to be 614. The tradition further states that this monastery was destroyed by the Avars in 670, when the abbot and thirty monks were martyred. The abbey, dedicated to Saint Martin of Tours, was then supposedly rebuilt by Charles Martel and Saint Pirmin about 711.

The second and current view, based on more substantial research, is however that the foundation did not take place until the early 8th century. This is corroborated by archaeological investigation showing that the first traceable structure on the site was built in or about 700 and was destroyed in about 940, which is attributed to raiding Saracens.