| Beuster | |
| Mouth Location: | Innerste |
| Mouth Coordinates: | 52.1192°N 9.9797°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Lower Saxony |
| Length Km: | 12.5 |
Beuster is a river of Lower Saxony, Germany. It flows into the Innerste south of Hildesheim. Its total length, including its source river Warme Beuster, is 12.5km (07.8miles).