Madhuca primoplagensis is a tree in the family Sapotaceae. The specific epithet primoplagensis means 'first region', referring to Sarawak's First or Kuching Division, the tree's native habitat.
Madhuca primoplagensis grows up to 20m (70feet) tall, with a trunk diameter of up to 35cm (14inches). The bark is dark brown. Inflorescences bear up to 13 flowers. The fruits are ellipsoid, up to 3cm (01inches) long.
Madhuca primoplagensis is endemic to Borneo, where it is known only from Sarawak. Its habitat is lowland forests from NaNm (-2,147,483,648feet) altitude.
Madhuca primoplagensis has been assessed as endangered on the IUCN Red List. The species is threatened by logging conversion of land to palm oil plantations.