Cotylelobium lanceolatum is a species of plant in the Dipterocarpaceae family. The name is derived from Latin (lanceolatus = in the form of a lance) and refers to the shape of the leaf blade. C. lanceolatum is a canopy tree, up to 45 m, found in kerangas forests on raised beach terraces and sandstone plateaux and on organic soils over limestone. The species is found in Peninsular Thailand, eastern coastal areas of Peninsular Malaysia, the Anambas Islands and Borneo. It is found in at least two protected areas (Bako National Park and Gunung Mulu National Park).