Castanopsis foxworthyi is a tree in the family Fagaceae. It is named for the botanist Frederick William Foxworthy.
Castanopsis foxworthyi grows as a tree up to 30m (100feet) tall with a trunk diameter of up to 60cm (20inches). The smooth bark is blackish brown. The coriaceous leaves measure up to 12cm (05inches) long. Its ovoid nuts measure up to 21NaN1 long.
Castanopsis foxworthyi grows naturally in Peninsular Malaysia and Borneo. Its habitat is dipterocarp, peat swamp and kerangas forests from sea-level to 2100m (6,900feet) altitude.