Tawny-bellied Cotton Rat
Sigmodon fulviventer
- Least concern
- Card rarity: Common
- Mammals

The tawny-bellied cotton rat is a species of rodent in the family Cricetidae. It is found in Mexico and in the US states of Arizona and New Mexico.
Classification
- Class
- Mammalia
- Order
- Rodentia
- Family
- Cricetidae
- Genus
- Sigmodon