Bukit Lumut Balai is a heavily eroded stratovolcano on Sumatra island, Indonesia. It consist of three eruption centers, two on the Bukit Lumut and one on the north-east side of the Bukit Balai. A large lava flow occurs on the north side of Bukit Balai. Active fumarole fields are found in two crescentic basins to the north of Bukit Lumut.