Diospyros discocalyx is a large tree in the family Ebenaceae. It grows up to tall, with a trunk diameter up to . The bark is black. Inflorescences bear three or more flowers. The fruits are round, up to in diameter. The specific epithet ' is from the Latin meaning 'disc-shaped calyx'. Habitat is lowland mixed dipterocarp forests, but sometimes found up to altitude. D. discocalyx is endemic to Borneo.