The Klosterbach is a right-hand tributary of the Große Aue, which is known as the Neuer Mühlenbach at the point where they join, in north Germany.

The Klosterbach lies entirely within the parish of Rödinghausen in the district of Herford, North Rhine-Westphalia.

The Klosterbach emerges north of Bieren near the Donoer Berg on the southern edge of the Wiehen Hills at a height of 152 m above sea level (NN).

The stream discharges into the Große Aue after 1.6 kilometres at a height of 94 m above NN at river kilometre 82.9 on the Aue.

This article related to a river in North Rhine-Westphalia is a stub.