Pterostylis fischii, commonly known as Fisch's greenhood, is a species of orchid endemic to south-eastern Australia.

The dorsal sepal curves forward and downward with a thread-like tip 5–15 mm long.

The lateral sepals are held closely against the galea, have an erect, thread-like tip 15–30 mm long and a broad V-shaped sinus between their bases.

[1][5] The specific epithet (fischii) honours the Fisch family of Doncaster who discovered the species in 1949.

[5] Fisch's greenhood grows among grasses and low shrubs in woodland and forest, mainly in the highlands of New South Wales south from the New England National Park, less commonly in eastern Victoria and southern Queensland.