Aceratium megalospermum, commonly known as bolly carabeen, creek aceratium or carabeen, is a plant in the family Elaeocarpaceae found only in the Wet Tropics bioregion of Queensland, Australia.
This is a small tree up to tall with small lanceolate to elliptic leaves arranged in opposite pairs. Flowers have five sepals and petals, and the petals are up to long by wide. Ripe fruit are red and contain a single seed. They measure about long and wide.
The species was first described as Aristotelia megalosperma by Ferdinand von Mueller in 1875, but in 1963 it was transferred to the genus Aceratium and given its current combination by the Indonesian-born botanist Max Michael Josephus van Balgooy.
The bolly carabeen is found only in coastal northeastern Queensland, from about Cooktown to about Tully. It grows in well developed rainforest at altitudes from sea level to about . It is often found in gullies and alongside creeks.
, the status of this species is assessed as least concern by the International Union for Conservation of Nature (IUCN) and under the Queensland Government's Nature Conservation Act.