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.

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.

This article related to a river in Estonia is a stub.