Klosterneuburg Abbey or Monastery is a twelfth-century Augustinian monastery of the Catholic Church located in the town of Klosterneuburg in Lower Austria. Overlooking the Danube, just north of the Vienna city limits at the Leopoldsberg, the monastery was founded in 1114 by Saint Leopold III of Babenberg, the patron saint of Austria, and his second wife Agnes of Germany.

The Canons Regular of St. Augustine are priests who live in community under a rule and are generally organised into religious orders, differing from both secular canons and other forms of religious life, such as clerics regular, designated by a partly similar terminology. As religious communities, they have laybrothers as part of the community.