Hiernia is a monotypic genus of flowering plants belonging to the family Orobanchaceae. It only contains one species, Hiernia angolensis <small>S.Moore</small>
Its native range is Angola and Namibia.
The genus name of Hiernia is in honour of William Philip Hiern (1839âÂÂ1925), a British mathematician and botanist. The Latin specific epithet of angolensis refers to coming from Angola. It was first described and published in J. Bot. Vol.18 on page 196 in 1880.