The three species of the genus Rhinacanthus Nees occurring in Angola and Namibia are documented, including a full description of the new species R. angolensis I. Darbysh. and an expanded description of the scarce species R. kaokoensis K. Balkwill and S. D. Will. A key to their identification is provided, together with notes on their conservation status and species affinities. Keywords: conservation, Guineo-Congolian, IUCN Red List assessment, justicioid, Kaokoveld, new species, taxonomy.