Oncorachis

{{Short description|Genus of grasses}}

{{Automatic taxobox

|taxon = Oncorachis

|authority = Morrone & Zuloaga

|display_parents = 3

}}

Oncorachis is a genus of grasses. It includes two species native to Brazil and Paraguay.{{cite web |title=Oncorachis Morrone & Zuloaga |url=https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:77099671-1 |website=Plants of the World Online |publisher=Royal Botanic Gardens, Kew |access-date=14 May 2025}}

• Oncorachis macrantha {{small|(Trin.) Morrone & Zuloaga}}
• Oncorachis ramosa {{small|(Zuloaga & Soderstr.) Morrone & Zuloaga}}