Oncidium geertianum

{{Short description|Species of orchid}}

{{Speciesbox

|image=Oncidium reflexum - Oncidium geertianum (as Oncidium caesium) - Xenia vol 1 pl 36 (1858).jpg

|image_caption=Oncidium geertianum (fig. II, right)

|genus=Oncidium

|species=geertianum

|authority=C.Morren

|synonyms=* Oncidium xanthochlorum Klotzsch

• Oncidium caesium Rchb.f.

|}}

Oncidium geertianum is a species of orchid native to central and southwestern Mexico.{{cite web |title=Oncidium geertianum C.Morren |url=http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:647120-1 |website=Plants of the World Online |publisher=Royal Botanical Gardens Kew |accessdate=2018-11-30}}