Stenothyrsus

{{Short description|Genus of plants}}

{{Speciesbox

| image =

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| genus = Stenothyrsus

| parent_authority = C.B.Clarke (1908)

| species = ridleyi

| authority = C.B.Clarke (1908)

}}

Stenothyrsus is a monotypic genus of flowering plants belonging to the family Acanthaceae. The only species is Stenothyrsus ridleyi. It is endemic to Perak in Peninsular Malaysia.{{cite web |title=Stenothyrsus C.B.Clarke {{!}} Plants of the World Online {{!}} Kew Science |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:956-1 |website=Plants of the World Online |access-date=25 May 2021 |language=en}}