Dipterocarpus oblongifolius is a species of tree in the family Dipterocarpaceae.

The specific epithet oblongifolius is from the Latin meaning 'oblong leaves'.

[3] Dipterocarpus oblongifolius is native to Thailand, Peninsular Malaysia and Borneo.

[3] Dipterocarpus oblongifolius has been assessed as least concern on the IUCN Red List.

The species is present in a number of protected areas in Borneo including Gunung Mulu National Park, Batang Ai National Park, Lanjak Entimau Wildlife Sanctuary and Gunung Lumaku Forest Reserve.