Hoya macgillivrayi, commonly known as red hoya or Macgillivray's wax flower, is a species of vine endemic to Cape York Peninsula in Queensland, and has egg-shaped to lance-shaped leaves and racemes of dark reddish-pink flowers, sometimes with a white centre, and a reddish-pink corona.
Hoya macgillivrayi is a vine with stems less than in diameter and containing white, milky sap. Its leaves are , egg-shaped to lance-shaped, up to long and to wide with two to five colleters. The flowers are fleshy, glabrous, flattened bell-shaped, dark reddish-pink, sometimes with a white centre, in diameter with six to ten flowers. Each flower is on a pedicel long and has narrowly oblong lobes long and wide with the edges curved down. The corona has linear lobes long and wide and reddish-pink. Flowering occurs from May to October and the fruit is a follicle about long and wide.
Hoya macgillivrayi was first formally described in 1914 by Frederick Manson Bailey in the Queensland Agricultural Journal from specimens collected by William MacGillivray near "Claudie River, Lloyd Bay". The specific epithet (macgillivrayi) honours the collector of the type specimens.
This species of Hoya grows in rainforest and monsoon forest in the Iron and McIlwraith Ranges on Cape York Peninsula, from sea level to .
Hoya macgillivrayi is listed as "near threatened" under the Queensland Government Nature Conservation Act 1992.
This species requires a loose, friable peaty soil mixture and good drainage. Plants perform better when root-bound, with small applications of slow-release fertiliser at nine-monthly intervals.