| Loobu | |
| Source1 Location: | Jõepere village in Pandivere |
| Subdivision Type1: | Country |
| Length: | 62km (39miles) |
| Source1 Elevation: | 90m (300feet) |
| Mouth Elevation: | 0m (00feet) |
| Discharge1 Avg: | 2.5- |
| Basin Size: | 308km2 |
The Loobu is a river in northern Estonia. Its source is about 12 km southwest of Rakvere in Lääne-Viru County and it drains into Eru Bay (part of Finnish Gulf) near the village of Vihasoo in Lahemaa National Park.
Its drainage basin is rather small and narrow. The Loobu lacks any major tributaries.
At Joaveski, 10 km upstream from its mouth, the Loobu flows over the Baltic Klint, forming Joaveski Falls.
Kadrina (population: 2,600) is the only significant settlement on the river.