Dryobalanops oblongifolia is a species of flowering plant in the family Dipterocarpaceae. It is a tree native to Borneo, Peninsular Malaysia, and Sumatra.
The species name is derived from Latin (' = rather long and leaf (' = leaf); and refers to the shape of the leaf.
Both produce heavy hardwood timber, which is sold under the trade name of Kapur.
There are two subspecies: