Lithocarpus gracilis is a tree in the beech family Fagaceae. The specific epithet gracilis means 'slender', referring to the twigs.
Lithocarpus gracilis grows as a tree up to tall with a trunk diameter of up to . Its buttresses grow up to in height. The greyish brown bark is smooth, fissured or scaly. Its coriaceous leaves measure up to long. The brownish acorns are ovoid to conical and measure up to across.
Lithocarpus gracilis grows naturally in Peninsular Malaysia, Sumatra, and Borneo. Its habitat is mixed dipterocarp (including kerangas) forests to elevation.
The timber is locally used in construction.