Mount Kujū (九重山, Kujū-san), located on the border of Kokonoe and Taketa in Ōita Prefecture, Japan, is a stratovolcano in Kyushu Island, Japan, with a summit elevation of 1,791 metres (5,876 ft).

The Kujū range consists of a dozen or so volcanic bodies gathered in a region of 13 km east-west and 10 km north-south.

The mountains in the range include: The Kujū volcanic group is mainly composed of andesite and dacite, which is defined as the volcanic activity above the Miyagi pyroclastic flow deposit which formed about 200,000 years ago.

Kujū are plateau grasslands whose main industry is dairy farming.

This Ōita Prefecture location article is a stub.