Merriam's Mouse
Peromyscus merriami
- Least concern
- Card rarity: Common
- Mammals

The mesquite mouse, also known as Merriam's deermouse, is a species of rodent in the family Cricetidae. It is a species of the genus Peromyscus, a closely related group of New World mice often called "deermice". it is native to Mexico, as well as Arizona in the United States.
Classification
- Class
- Mammalia
- Order
- Rodentia
- Family
- Cricetidae
- Genus
- Peromyscus