Pterostylis aestiva, commonly known as the long-tongued summer greenhood,[2] is a species of orchid endemic to south-eastern Australia.

The lateral sepals are held closely against the galea, have an erect, thread-like tip 25–35 millimetres (0.98–1.4 in) long and a protruding sinus between their bases.

[2][3][4][5] Pterostylis aestiva was first formally described in 1972 by David Jones from a specimen collected near Wulgulmerang.

[6][7] The specific epithet (aestiva) is a Latin word meaning "pertaining to summer".

[8] The long-tongued summer greenhood grows among grasses in high rainfall forests in north-east Victoria and New South Wales as far north as Mount Canobolas.