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The Fox Valley—also commonly known as the Fox River Valley—is a region centered on the Fox River of Northern Illinois, along the western edges of the Chicago metropolitan area.  The region extends from the village of Antioch in far northern Illinois, to the city of Ottawa in the south.  It includes rural areas, suburban development, and 19th-century downtowns. Around 1 million people live in this area.
Some of cities in the Fox River Valley are part of the Rust Belt. Within this region is Aurora, the second largest city in the state, Elgin, and the nearby cities of Batavia, St. Charles, and Geneva, which have been known as the Tri-City area  since the early 20th century.
The following is a list of cities and villages from north to south, along the Fox River Valley:
- Illinois Department of Natural Resources (2001). "Major Watersheds of Illinois" (PDF). Illinois State Water Survey. Illinois Department of Natural Resources. Retrieved August 11, 2014.
- Heun, Dave (August 2, 2014). "Dean Street a Microcosm of St. Charles". Daily Herald. Arlington Heights, IL. Retrieved August 11, 2014.