Microtis parviflora, commonly known as the slender onion-orchid, is a species of orchid which is native to Australia and New Zealand.

Between ten and eighty small green flowers are crowded on an erect, fleshy raceme 20–50 cm (8–20 in) tall.

The dorsal sepal is egg-shaped to round, about 2 mm (0.08 in) long and with the petals forms a hood over the column.

[1][2][3][4] Microtis parviflora was first formally described by Robert Brown in 1810 and the description was published in Prodromus Florae Novae Hollandiae et Insulae Van Diemen.

It is found on the North and South Islands of New Zealand where it usually grows in places with little overhead vegetation.