| Kösterbeck | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Mecklenburg-Vorpommern |
| Subdivision Type3: | Reference no. |
| Subdivision Name3: | DE: 96494 |
| Source1 Location: | Teufelsmoor near Sanitz |
| Mouth Location: | near Kessin into the Warnow |
| River System: | Coastal region |
| Custom Label: | Navigable |
| Custom Data: | no |
The Kösterbeck is a river near Rostock in the German state of Mecklenburg-Vorpommern. It is a tributary of the Warnow. The little river runs through the nature reserve of the same name in the parish of Roggentin in a part of Rostock Switzerland. This hilly landscape was formed as a terminal moraine in the ice age.
The Kösterbeck is fed from several small runlets, that drain the Teufelsmoor ("Devil's Moor") near Sanitz, and by the Moehlenbäk ca. 1.5 km south of Sanitz. As a result of agricultural use, the Kösterbeck has had its natural course changed. The Kösterbeck is crossed at Kessin by the A 19 motorway and empties, after 1.3 kilometres, into the Warnow.