Alston's cotton rat
Sigmodon alstoni
- Least concern
- Card rarity: Common
- Mammals

Alston's cotton rat is a rodent species from South America. It is found in Brazil, Colombia, Guyana, Suriname, and Venezuela, where it inhabits lowland savannas.
Classification
- Class
- Mammalia
- Order
- Rodentia
- Family
- Cricetidae
- Genus
- Sigmodon