Weesen Abbey is a monastery of Dominican nuns located in Weesen in the Canton of St. Gallen, Switzerland. The Dominican convent is located at the foot of a terraced hillside in the middle of the town of Weesen on the effluence of the Maag respectively Linth from Walensee. Established in 1256, Weesen is the oldest Dominican friary of nuns in Switzerland. The buildings and the library respectively archives are listed in the Swiss inventory of cultural property of national and regional significance.