Stylidium leptorrhizum is a species of dicotyledonous plant in the family Stylidiaceae.

Oblanceolate or elliptical leaves, about 10-20 per plant, form a basal rosette with stems absent.

Inflorescences are 8–25 cm long and produce pink or mauve flowers that bloom from May to August in their native range.

S. leptorrhizum is endemic to the Kimberley region of Western Australia and the Victoria River district of the Northern Territory.

When reviewing section Debilia, Anthony Bean reduced the recently described S. barrettorum to synonymy with S. leptorrhizum after examining the type specimen.