Habenaria macraithii, commonly known as whiskered rein orchid, is a species of orchid that is endemic to a small area in far north Queensland. It has up to eleven scattered leaves and up to twenty five relatively large green flowers with thread-like petal lobes.
Habenaria macraithii is a tuberous, perennial herb with between seven and eleven scattered bluish green leaves, long and wide. Between fifteen and twenty five green flowers, long and wide are borne on a flowering stem tall. The and sepals are long and about wide, the lateral sepals are narrow egg-shaped and spread widely apart from each other. The petals have two lobes. One lobe is long, about wide and tapered, the other thread-like and long. The labellum has three lobes. The side lobes are thread-like, long and the middle lobe is linear and long. The labellum spur turns downwards and is long. Flowering occurs from July to September.
Habenaria macraithii was first formally described in 1984 by Bill Lavarack and the description was published in The Orchadian. The specific epithet (macraithii) honours Gerald McCraith of the Australian Orchid Foundation. In Australia, the species is formally known as Habenaria maccraithii.
The whiskered rein orchid grows on levees in rainforest. It is only known from a few sites in the Kutini-Payamu and Kulla National Parks.
Habenaria macraithii is listed as "endangered" under the Australian Government EPBC Act.