{ { Speciesbox
| status = PE
| status_system = IUCN3.1
| status_ref = <ref name="iucn status 19 May 2022">{ { cite iucn |author=Mercado Silva, N. |author2=Espinosa Pérez, H. |date=2019 |title=BChirostoma charari. The IUCN Red List of Threatened Species 2019: e.T191131A1970680 |volume=2019 |doi=10.2305/IUCN.UK.2019-2.RLTS.T191131A1970680.en |access-date=20 May 2022}}</ref> | taxon = Chirostoma charari | authority = de Buen, 1945 | synonyms = *Eslopsarum bartoni charari }}Chirostoma charari, the least silverside, is a species of neotropical silverside endemic to Mexico. This species has only been found in a spring in the Lake Cuitzeo basin on the Mesa Central of the Mexican Plateau. It has a longer head and jaw, as well as larger teeth and eyes than other Chirostoma'' species. Its status is rated as Critically Endangered by the IUCN, and may possibly be extinct.