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is a census-designated place (CDP) in Pima County, Arizona, United States. The population was 17,283 at the 2000 census.
According to the United States Census Bureau, the CDP has a total area of 26.3 square miles (68.0 km²), of which, 26.2 square miles (68.0 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.08%) is water.
Green Valley is twenty miles (32 km) south of Tucson and north of Nogales, Sonora, Mexico. Surrounded by copper mines, and near the hiking and birding areas of the Santa Rita Mountains, Green Valley is now an unincorporated retirement community.
The largest of the mines are the Sierrita Mine owned by Phelps Dodge and the Mission Mine of ASARCO. Compared to other mines in Arizona the two mines are large; Sierrita is low-grade.