Stylidium exappendiculatum is a species of dicotyledonous plant in the genus Stylidium (family Stylidiaceae).
It was first described in 1991 by Allen Lowrie and Sherwin Carlquist as a subspecies of Stylidium emarginatum, and was raised to species level by Juliet Wege in 2012. According to the Catalogue of Life, Stylidium exappendiculatum does not have any known subspecies.