Delicate vesper mouse

{{Short description|Species of rodent}}

{{Speciesbox | name = Delicate vesper mouse

| status = LC | status_system = IUCN3.1

| status_ref = {{cite iucn |last1=Leite |first1=Y. |last2=Patterson |first2=B. |year=2016 |title=Calomys tener |volume=2016 |errata=2017 |page=e.T3617A115066286 |doi=10.2305/IUCN.UK.2016-3.RLTS.T3617A22335203.en |access-date=27 September 2024}}

| genus = Calomys

| species = tener

| authority = Winge, 1888

}}

The delicate vesper mouse (Calomys tener) is a South American rodent species of the family Cricetidae.{{MSW3 Muroidea | id = 13000623 | pages = 1108–1109}} It is found in Argentina, Bolivia and Brazil. Its karyotype has 2n = 66 and FN = 66.