Ilex megaphylla is a tree in the holly family Aquifoliaceae, native to Borneo. The specific epithet megaphylla means 'large leaves'.
Ilex megaphylla grows up to 8m (26feet) tall. The smooth bark is grey. The leathery leaves are lanceolate to oblong and measure up to long. The inflorescences, in cymes, feature white flowers.
Ilex megaphylla is endemic to Borneo, where it is confined to Sarawak. It is only found in Gunung Buda National Park and Gunung Mulu National Park, where species populations are adequately conserved. Its habitat is on hills and cliffs of limestone, at elevations of around .