Genoplesium parvicallum, commonly known as the mountain-top midge-orchid, is a species of orchid which is endemic to Queensland.

It is a small orchid with up to twenty five greenish flowers with purplish brown marking and is only known from mountaintops in the McPherson Range.

[2][3] The mountain-top midge orchid was first formally described in 1945 by Herman Rupp who gave it the name Prasophyllum parvicallum from a specimen collected on Mount Greville and the description was published in The Queensland Naturalist.

[1][5] The specific epithet (parvicallum) is derived from the Latin word parvus meaning "little"[6] referring to the small labellum callus of this orchid.

[3] The mountain-top midge-orchid is only known from the summits of a few mountains in the McPherson Range where it grows in shallow soil over rock ledges with grasses and shrubs.