Melaleuca osullivanii is a plant in the myrtle family, Myrtaceae and is endemic to the south-west of Western Australia.

[2] Melaleuca osullivanii was first formally described in 2004 by Lyndley Craven and Brendan Lepschi in Australian Systematic Botany.

[4][5] The specific epithet (osullivanii) is a reference to Wayne O'Sullivan who has contributed to studies of Melaleuca species in the field.

[2] This melaleuca occurs in and between the Perth, and Busselton districts[2] in the Jarrah Forest and Swan Coastal Plain biogeographic regions.

[6] It often grows in sand in association with other heathy species of Melaleuca, Hakea, Grevillea and introduced grasses in areas close to the coast that are wet in winter.