Green Valley is an unincorporated community and census-designated place (CDP) in Pima County, Arizona, United States. The population was 22,616 at the 2020 census.

Pima County is a county in the south central region of the U.S. state of Arizona. As of the 2020 census, the population was 1,043,433, making it Arizona's second-most populous county. The county seat is Tucson, where most of the population is centered. The county is named after the Pima Native Americans, also known as Tohono O'odham, who are indigenous to this area.