Brillantaisia is a genus of plants in the family Acanthaceae. They are native to the African tropics and subtropics, including Madagascar. They may grow from 20 cm to 2 m in height. Their hirsute stems are square in cross-section and their heart-shaped leaves have an opposite arrangement. Their purple or white pea-like flowers produce long, cigar-shaped seed pods. They reproduce easily from seeds or vegetatively. One species, B. lamium, is invasive in Queensland.
Species 14 species are accepted. Brillantaisia cicatricosa Lindau Brillantaisia debilis Burkill Brillantaisia fulva Lindau Brillantaisia grottanellii Pic.Serm. Brillantaisia lamium (Nees) Benth. Brillantaisia lancifolia Lindau Brillantaisia madagascariensis T.Anderson ex Lindau Brillantaisia oligantha Milne-Redh. Brillantaisia owariensis P.Beauv. Brillantaisia pubescens T.Anderson ex Oliv. Brillantaisia richardsiae Vollesen Brillantaisia riparia (Vollesen & Brummitt) Sidwell Brillantaisia stenopteris Sidwell Brillantaisia vogeliana Benth.
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