Castanopsis paucispina is a tree in the family Fagaceae.

[3] Castanopsis paucispina grows as a tree up to 30 metres (100 ft) tall with a trunk diameter of up to 60 cm (24 in).

The brown bark is smooth to slightly cracked.

Its obovoid to roundish nuts measure up to 4 cm (1.6 in) long.

[1][3] Its habitat is hill dipterocarp forests up to 1,100 m (3,600 ft) elevation.