Hibiscadelphus stellatus is a species of flowering plant in the mallow family, Malvaceae.

It is called stellar hau kuahiwi in the United States Department of Agriculture PLANTS database.

[1] The specific epithet stellatus comes from the Latin for "star-shaped", referring to its stellate pubescence and the five, star-shaped involucral bracts, as well as its "beautiful and stellar (outstanding) flowers".

[1] It is only known from three populations and fewer than one hundred plants in a valley on the western side of the island.

It is closely related to Hibiscadelphus wilderianus, differing in part in its denser hairiness and larger flowers.