Conostylis teretiuscula is a rhizomatous, tufted perennial, grass-like plant or herb in the family Haemodoraceae and is endemic to the south west of Western Australia.

[2][3][4] Conostylis teretiuscula was first formally described in 1873 by Ferdinand von Mueller in his Fragmenta phytographiae Australiae, from specimens collected by Augustus Oldfield.

[5][6] The specific epithet (teretiuscula) means "somewhat terete".

[7] This species of conostylis grows in sandy soil and in clay depressions between the Irwin River and Gingin, and near Walkaway, in the Avon Wheatbelt, Geraldton Sandplains, Jarrah Forest and Swan Coastal Plain bioregions of western Western Australia.

[2][3][4] Conostylis teretiuscula is listed as "not threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions.