Onychostoma simum

{{Short description|Species of fish}}

{{Speciesbox

|image =

| status = DD

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Huckstorf, V. |date=2012 |title=Onychostoma simum |volume=2012 |page=e.T166976A1158870 |doi=10.2305/IUCN.UK.2012-1.RLTS.T166976A1158870.en |access-date=19 November 2021}}

|taxon = Onychostoma simum

|authority = (Sauvage, Dabry de Thiersant, 1874)

| synonyms = *Barbus simus Sauvage & Dabry de Thiersant, 1874

• Varicorhinus simus (Sauvage & Dabry de Thiersant, 1874)

| synonyms_ref = {{FishBase|Onychostoma|simum|month=August|year=2019}}

}}

Onychostoma simum is a species of cyprinid in the genus Onychostoma. It inhabits China and Vietnam. It has a maximum length of {{convert|34.5|cm|in}} and a common length of {{convert|24.0|cm|in}}.