Delicate vesper mouse
Calomys tener
- Least concern
- Card rarity: Common
- Mammals

The delicate vesper mouse is a South American rodent species of the family Cricetidae. It is found in Argentina, Bolivia and Brazil. Its karyotype has 2n = 66 and FN = 66.
Classification
- Class
- Mammalia
- Order
- Rodentia
- Family
- Cricetidae
- Genus
- Calomys