St. Florian Monastery (German: Stift Sankt Florian) is an Augustinian monastery in the town of Sankt Florian, Austria. Founded in the early ninth century, and later refounded by Augustinians in the eleventh century, St. Florian is the largest monastery in Upper Austria, and rivals Melk Abbey and Klosterneuburg Monastery as among the most impressive examples of Baroque architecture in Austria. The monastery is dedicated to Saint Florian, whose fourth century grave lies beneath the monastery.