Madhuca prolixa is a tree in the family Sapotaceae. The specific epithet prolixa means 'expanded', referring to the inflorescences.
Madhuca prolixa grows up to tall, with a trunk diameter of up to . The bark is greyish brown. Inflorescences bear up to eight flowers. The fruits are yellowish-grey, subglobose, up to in diameter.
Madhuca prolixa is endemic to Borneo. Its habitat is lowland mixed dipterocarp forest from altitude.
Madhuca prolixa has been assessed as near threatened on the IUCN Red List. The species is threatened by logging and conversion of land for palm oil plantations.