Wettingen Abbey (Kloster Wettingen) was a Cistercian monastery in Wettingen in the Swiss canton of Aargau. It was founded in 1227 and dissolved during the secularisation of 1841, but re-founded at Mehrerau in Austria in 1854. The buildings are listed as a heritage site of national significance.
Count Heinrich II of Rapperswil bought lands in Wettingen sometime after 1220, and gave it the name Wettingen, believed to be named after his wife's family von Wetterau. He had married in 1220 to Mechtidis von Wetter, her brother was Count Lutold I von Wetter. And as well as the advowson of the village church. After being miraculously saved from shipwreck during the crusades, he gave his possessions in Wettingen to Salem Abbey, a Cistercian house in the north of the region around the Bodensee. The piece of land for the construction of the new buildings was given by the nunnery at Schänis. Eberhard of Rohrdorf, abbot of Salem, dispatched the twelve monks necessary for a new foundation and some lay-brothers under Konrad, the abbot-designate, previously Eberhard's deputy.
On 14 October 1227 the monks began building the monastery, called Stella Maris (Latin: "Star of the sea"). In memory of their generous founder they also adopted the motto "Non mergor" (Latin for "I do not sink"). From the beginning the abbey was able to add to its possessions: in Uri, in Zürich, in Riehen and above all in the valley of the Limmat in the area round Wettingen. In the Limmat valley the abbey possessed the authority of the low justice. The "Vögte" (lords protector) were the Habsburgs until 1415, and after that the Old Swiss Confederacy.