Desmos polycarpus is a species of plants in the custard apple family Annonaceae found only in northeastern Queensland, Australia.

Flowers are about 5 cm (2.0 in) wide and greenish yellow, with 3 sepals and 6 petals in two whorls of 3.

It is found in rainforest and gallery forest from about Lockhart River on Cape York Peninsula, to the Atherton Tableland southwest of Cairns.

[4][5][6] This species is listed as least concern under the Queensland Government's Nature Conservation Act.

[1] As of 11 January 2025[update], it has not been assessed by the International Union for Conservation of Nature (IUCN).