Rubroshorea kunstleri (called, along with some other species, red balau) is a species of flowering plant in the family Dipterocarpaceae. It is a tree native to Sumatra, Peninsular Malaysia, and Borneo.
It is a large tree growing up to 55 metres tall, with a straight cylindrical bole supported by spreading buttresses, branching into a few large ascending limbs that create a large, loose, cauliflower-shaped crown. It is native to lowland mixed dipterocarp rain forests up to 800 metres elevation, where it grows on leached sandy clay soils on low hills and ridges.